Moral relativism is the philosophical position that moral judgments are not universally true or false but are instead valid only relative to a particular cultural, historical, or individual framework. In its most common form, it holds that when two cultures disagree about whether a practice is morally right or wrong, neither culture is objectively correct -- each is right according to its own standards, and there is no neutral vantage point from which to adjudicate between them. The position has been one of the most debated ideas in ethics since the ancient Greek sophist Protagoras declared that "man is the measure of all things" in the fifth century BC, and it remains at the center of contemporary arguments about human rights, cultural diversity, and the foundations of morality.

The appeal of moral relativism is easy to understand. In a world of genuine cultural diversity, the claim that one particular moral framework has exclusive access to objective truth can seem arrogant. The history of Western civilization's confident judgments about the inferiority of other cultures -- judgments that were used to justify slavery, colonialism, and genocide -- provides ample reason to be suspicious of moral universalism. The willingness to suspend such claims in favor of respectful engagement with other ways of life seems both intellectually humble and politically admirable.

But the philosophical difficulties with moral relativism are equally serious. If moral judgments are true only relative to a cultural framework, then the abolition of slavery was not a moral improvement but merely a change. The suffragettes who argued that women deserved equal political rights were not making a true claim but merely expressing the values of their own evolving cultural niche. The Nuremberg trials were not genuine justice but the imposition of the victors' moral standards on the defeated. These conclusions strike most people as not merely counterintuitive but morally catastrophic, and the difficulty of avoiding them while maintaining normative relativism is the central challenge the position faces.

"Morality differs in every society, and is a convenient term for socially approved habits." -- Ruth Benedict, Patterns of Culture (1934)

The Three Types of Moral Relativism

Understanding moral relativism requires distinguishing between three fundamentally different claims that are frequently conflated. The failure to separate them is responsible for much of the confusion in popular discussions of the topic.

Descriptive moral relativism is the empirical observation that different cultures hold different and sometimes incompatible moral beliefs. The Inuit practiced senilicide; Victorian England considered it murder. Many traditional societies practice polygyny; Western liberal democracies mandate monogamy. Some cultures regard homosexuality as natural variation; others regard it as a capital offense. This diversity is a sociological fact that is largely uncontested among anthropologists, historians, and philosophers alike.

Normative moral relativism is the philosophical claim that moral judgments are true or false only relative to a cultural framework, and that there is no culture-independent standard by which competing moral systems can be evaluated. This is the controversial position. It moves from the observation that cultures disagree to the conclusion that neither side is objectively right.

Metaethical relativism is the position that there are no objective moral facts at all -- that moral claims do not express propositions that are true or false independently of the attitudes of the groups making them. Philosophers like J.L. Mackie, who argued in Ethics: Inventing Right and Wrong (1977) that all moral statements are literally false because there are no moral facts for them to correspond to, represent this more radical position.

The critical logical gap lies between the first and second types. Descriptive relativism is an observation; normative relativism is a conclusion. The fact that cultures disagree about morality no more proves that there are no objective moral truths than the fact that cultures once disagreed about the shape of the earth proved that there is no objective fact about its geometry. The inference from disagreement to the absence of truth requires additional philosophical work that has proven extraordinarily difficult to complete.

Origins and Anthropological Foundations

Protagoras and the Ancient Roots

The philosophical roots of moral relativism stretch back to ancient Greece. Protagoras (c. 490-420 BC), as reported by Plato in the Theaetetus, held that truth itself is relative to the perceiver. His famous dictum -- "Of all things the measure is man" -- was interpreted even in antiquity as a claim that there are no objective facts, only perspectives. Plato devoted considerable energy to refuting this position, arguing in multiple dialogues that some things are genuinely better and worse, and that the skilled practitioner (the doctor, the navigator, the statesman) has access to truths that the unskilled person lacks.

Herodotus, the fifth-century historian, provided some of the earliest recorded observations of moral diversity. In his Histories (c. 440 BC), he described how the Greeks burned their dead while the Callatiae ate theirs -- and how each group was horrified by the other's practice. He concluded that custom is "king of all," a statement that has been read as an early expression of cultural relativism. A 2019 analysis by Maria Teresa Puga Garcia at the University of Madrid argued that Herodotus was making a descriptive rather than normative point -- observing diversity without concluding that no practice is objectively better.

Franz Boas and the Critique of Evolutionary Anthropology

The late nineteenth-century anthropology that Franz Boas encountered when he entered the field was dominated by evolutionary frameworks that ranked human cultures on a single developmental scale. Lewis Henry Morgan's Ancient Society (1877) divided human social development into stages of savagery, barbarism, and civilization. Herbert Spencer applied Darwinian concepts to social development, generating the doctrine of social Darwinism. These frameworks positioned Western industrial societies at the pinnacle of human development and relegated all other societies to earlier stages, providing apparent scientific warrant for colonial domination.

Boas, who was born in Germany in 1858 and trained in physics and geography before turning to anthropology, challenged this framework on both empirical and methodological grounds. His field research among the indigenous peoples of the Pacific Northwest and Canada, beginning in the 1880s, convinced him that cultural practices could not be explained by position on a single developmental scale but required understanding in terms of the specific historical, environmental, and social circumstances of each culture. The complexity, sophistication, and internal coherence of cultures that evolutionary anthropologists had labeled "primitive" was evident to Boas from direct engagement.

Boas's methodological principle -- that every culture must be understood from within its own framework, in terms of its own logic and values, rather than measured against an external standard -- became the foundation of what his students would develop into cultural relativism. His explicit anti-racist commitments, expressed in The Mind of Primitive Man (1911) and amplified in subsequent decades, connected the methodological point to a political stance: the claim that some cultures or races are inherently superior had no scientific foundation and served primarily to justify exploitation.

Ruth Benedict and Patterns of Culture

Ruth Benedict's Patterns of Culture (1934) is the most widely read statement of cultural relativism and one of the most influential books in twentieth-century American intellectual culture. Benedict argued that each culture is a coherent whole -- what she called a "pattern" or "configuration" -- organized around a distinctive set of values, and that the proper analogy is to individual personality rather than to mechanical structure.

Benedict compared three cultures to illustrate the point: the Pueblo peoples of the American Southwest, characterized as "Apollonian" (valuing sobriety, cooperation, and moderation); the Dobu islanders of Melanesia, characterized as suspicious and competitive; and the Kwakiutl of the Pacific Northwest, characterized as "Dionysian" (valuing emotional excess, rivalry, and displays of wealth). Her explicit argument was that what counts as normal or abnormal behavior, admirable or pathological character, varies systematically across these cultural patterns -- and that there is no culture-neutral standard by which to adjudicate between them.

The anthropological and philosophical reception of Patterns of Culture was mixed. Critics noted that Benedict's characterizations were highly selective and that her generalizations about whole cultures from limited fieldwork were methodologically problematic. A 2015 reassessment by Thomas Hylland Eriksen at the University of Oslo noted that Benedict's work, while groundbreaking for its time, relied on what contemporary anthropologists would consider an oversimplified model of cultural coherence. The philosophical conclusion -- normative relativism -- was contested by philosophers who noted that the descriptive diversity she documented did not logically entail that no cross-cultural moral judgments were possible.

The Philosophical Structure of Relativism

The Argument from Disagreement

The most influential philosophical argument for normative moral relativism appeals to the fact of persistent cross-cultural moral disagreement. If there were objective moral truths, the argument runs, we would expect moral beliefs to converge over time through reason and evidence, in the way that scientific beliefs about the physical world have converged. Instead, cross-cultural moral disagreement persists and in some domains may be deepening. The best explanation for this persistent disagreement is that there are no objective moral facts to converge on -- moral beliefs are expressions of cultural values, not discoveries of moral reality.

The argument faces several serious objections. First, the analogy with scientific convergence is imperfect: scientific convergence occurred precisely because scientific communities developed shared methods for testing claims against evidence and revising beliefs in light of results. If moral inquiry has not achieved similar convergence, this may reflect inadequate methods rather than the absence of moral facts. Second, much apparent cross-cultural moral disagreement may reflect disagreement about facts rather than values: many societies that practice female genital cutting do so in the belief that it is beneficial for women's health and social integration -- beliefs that may be empirically false. If both societies agreed on the facts, they might agree on the moral conclusion.

Third, Derek Parfit argued in On What Matters (2011) that moral philosophy is still a young discipline compared to the natural sciences, and that convergence may simply require more time and more rigorous argument. Parfit pointed out that moral philosophers have in fact achieved substantial convergence on many questions -- the wrongness of torture for entertainment, the moral equality of persons regardless of race, the importance of impartiality in justice -- even if headline disagreements about abortion, euthanasia, and distributive justice remain.

Tolerance and the Self-Undermining Problem

The argument from tolerance -- that moral relativism supports the value of respectful tolerance of cultural diversity -- faces what philosophers call a self-refutation problem. If normative relativism is correct, then tolerance is not an objective moral requirement but merely a value held by some cultures (those that have adopted relativist frameworks). The relativist cannot consistently argue that other cultures ought to be more tolerant, since "ought" claims are themselves relative to cultural frameworks. A culture that is genuinely intolerant and ethnocentric, on the relativist's own principles, is simply expressing its cultural values and cannot be criticized for failing to live up to a universal standard of tolerance.

James Rachels articulated this problem precisely in "The Challenge of Cultural Relativism" (1986): relativism, if consistently applied, removes the basis for criticizing any cultural practice on moral grounds, including practices that virtually everyone finds morally abhorrent -- ritual torture, female infanticide, institutionalized slavery. The relativist who says these practices are wrong is inconsistently invoking a universal standard they have officially renounced; the relativist who says they are merely different is accepting conclusions that seem morally catastrophic.

This is sometimes called the reformer's dilemma. Within any culture, moral reformers -- abolitionists, suffragettes, civil rights activists -- have argued that their culture's prevailing practices were wrong. If moral relativism is true, the standards against which they measured their cultures can only be the culture's own standards, making reform logically incoherent when it appeals to principles the culture does not yet accept. Martin Luther King Jr. did not argue that segregation violated the standards of the segregationist South; he argued that it violated principles of justice that were binding regardless of what any culture believed.

Moral Relativism and Moral Progress

The Progressive Challenge

The most powerful challenge to normative moral relativism comes from our deeply held conviction that moral progress is real. The abolition of slavery, the enfranchisement of women, the prohibition of torture as official state policy, the development of international human rights law -- these represent, most people believe, genuine moral improvements, not merely changes in moral fashion. A 2017 survey by the Pew Research Center found that 93% of respondents across 38 countries agreed that equality between men and women is at least "somewhat important" -- a remarkably high level of cross-cultural convergence on a value that was far from universal two centuries ago.

On normative relativism, this belief is systematically mistaken: what we call moral progress is only the replacement of one cultural moral system with another, and there are no cross-cultural standards that could make the replacement an improvement.

Peter Singer's The Expanding Circle (1981) and Steven Pinker's The Better Angels of Our Nature (2011) both argue for a conception of moral progress as genuine, driven by the extension of empathy and moral reasoning beyond in-group boundaries. Pinker's data on the historical decline of violence, when measured as rates rather than absolute numbers, suggests that the human moral psychology has genuinely changed over centuries -- and that these changes represent progress by standards that are not merely parochial. Pinker documents that homicide rates in Western Europe fell from roughly 100 per 100,000 people in the medieval period to approximately 1 per 100,000 by the late twentieth century -- a decline that is difficult to explain as mere cultural variation rather than genuine improvement.

The relativist has responses available. Progress within a tradition can be understood as the more consistent application of that tradition's own values -- the abolition of slavery was demanded by the application of principles of human dignity and liberty that the slaveholding societies themselves officially endorsed. On this view, moral progress is intra-systemic rather than cross-cultural. But the problem is that the moral reformers who achieved these advances typically appealed to universal principles that they held to be binding on all cultures, not merely to the standards of their own tradition.

The Human Rights Challenge

The Universal Declaration of Human Rights (1948), drafted in the aftermath of the Holocaust, represents the most ambitious attempt to articulate moral standards that apply across cultural boundaries. Its drafting committee, chaired by Eleanor Roosevelt, included representatives from China, Lebanon, France, the United Kingdom, Australia, Chile, and the Soviet Union -- a deliberate effort to produce a document that was not merely Western.

The philosopher Jacques Maritain, who advised the UNESCO committee that contributed to the Declaration, reportedly said: "We agree on these rights, providing no one asks us why." This observation captures both the strength and the vulnerability of the human rights framework. The practical convergence is real -- representatives of radically different cultural and philosophical traditions agreed on a list of rights. But the philosophical justification varies across traditions, and the relativist argues that without a shared philosophical foundation, the agreement is contingent rather than principled.

Michael Ignatieff argued in Human Rights as Politics and Idolatry (2001) that human rights need not be grounded in any particular philosophical or religious tradition to be effective. What matters is that they serve as a practical framework for constraining the worst abuses of power. This minimalist approach to human rights sidesteps the philosophical debate between relativism and universalism by focusing on what human rights do rather than what grounds them.

Alternative Frameworks for Cross-Cultural Ethics

The Capabilities Approach

Amartya Sen and Martha Nussbaum developed the capabilities approach as a framework for evaluating human development and social arrangements that is neither imperialist universalism nor normative relativism. Rather than specifying a particular conception of the good life, the capabilities approach identifies a set of central human capabilities -- the ability to live a life of normal human length; to have good physical health; to use one's senses and imagination; to experience emotions; to exercise practical reason; to affiliate with others -- whose development is required for any minimally dignified human life.

Nussbaum's version of the approach, developed in Women and Human Development (2000) and Creating Capabilities (2011), is explicitly non-relativist: practices that systematically deprive people of basic capabilities -- female genital cutting, restrictions on women's education and mobility, discrimination based on caste or sexual orientation -- can be criticized on grounds that apply across cultural contexts without claiming that every aspect of Western liberal culture is universally valid. The capabilities approach provides a floor of requirements while leaving substantial space for cultural variation above that floor.

Sen, who received the Nobel Prize in Economics in 1998, grounded his version more firmly in the concept of freedom. In Development as Freedom (1999), he argued that development should be measured not by GDP per capita but by the substantive freedoms people enjoy -- freedom from hunger, illiteracy, preventable disease, and political oppression. This framework has been adopted by the United Nations Development Programme and informs the Human Development Index used to compare national well-being.

Overlapping Consensus

John Rawls's approach in The Law of Peoples (1999) distinguished between reasonable pluralism -- the diversity of comprehensive moral and religious doctrines that characterizes any free society -- and fundamental human rights. Rawls argued that while a global "liberal" consensus is neither achievable nor appropriate as an aim, an overlapping consensus around a limited set of basic human rights -- prohibitions on slavery, torture, genocide, and arbitrary killing -- can be justified from within many different cultural and religious frameworks.

This approach is philosophically interesting because it does not require a universal foundation for human rights but only convergence from different starting points. It is also politically pragmatic: rather than demanding that all cultures adopt a comprehensive liberal political philosophy, it identifies the minimum conditions for international order and cross-cultural moral discourse.

Moral Pluralism

David Wong offers a sophisticated middle path in Natural Moralities: A Defense of Pluralistic Relativism (2006). Wong argues that there are objective constraints on what can count as an adequate morality -- any workable moral system must promote social cooperation, regulate conflict, and sustain interpersonal relationships -- but that these constraints are compatible with multiple, genuinely different moral systems. On this view, there is not one correct morality but several adequate moralities, each adapted to the particular circumstances and history of different communities.

Wong's pluralistic relativism avoids the most devastating objections to standard relativism. It can explain moral progress (a society that better meets the objective functional constraints has genuinely improved), it can criticize certain practices as objectively inadequate (systems that fail to promote cooperation or that systematically brutalize their members), and it preserves the insight that genuine moral diversity is possible.

Disagreeing Across Cultures: Practical Lessons

The Anthropological Hermeneutic Circle

Anthropological fieldwork has produced an important practical insight about cross-cultural moral disagreement: apparent disagreements often dissolve under close examination. James Rachels and others have noted that many practices that seem morally different across cultures reflect different factual beliefs rather than different underlying values. A society that leaves elderly people to die alone does not necessarily value the elderly less than one that provides elaborate care; they may believe that the dying prefer solitude, or that the afterlife is more important than the dying process, or that scarce resources are needed for children who can still be saved.

Richard Shweder, a cultural psychologist at the University of Chicago, conducted extensive fieldwork in Orissa, India, documented in Thinking Through Cultures (1991). He found that what appeared to Westerners as moral violations -- rigid caste rules, restrictions on widows -- were understood within the local framework as expressions of deeply held values about purity, cosmic order, and the moral significance of social roles. Shweder argued that understanding these internal logics is a prerequisite for meaningful cross-cultural moral dialogue, though he stopped short of endorsing full normative relativism.

When genuine value disagreement remains after factual clarification, the appropriate response is not the relativist suspension of judgment but moral argument: the presentation of reasons, the identification of inconsistencies, the appeal to analogy, the exploration of implications. Moral argument across cultural lines is possible and has been historically effective -- the international abolitionist movement, the global women's suffrage movement, the post-Holocaust development of international human rights law all involved successful cross-cultural moral persuasion.

Moral Relativism in Everyday Life

The practical relevance of moral relativism extends beyond academic philosophy. In an increasingly interconnected world, individuals regularly encounter moral frameworks different from their own -- through immigration, international business, travel, and digital communication. The question of how to navigate these encounters is not abstract.

The most productive approach, supported by both philosophical analysis and psychological research, occupies a middle ground. It combines the methodological insight of cultural relativism -- understand practices in their own context before evaluating them -- with the philosophical conviction that some moral standards apply across cultural boundaries. Kwame Anthony Appiah, in Cosmopolitanism: Ethics in a World of Strangers (2006), calls this stance "cosmopolitanism" and argues that it requires both genuine curiosity about other ways of life and the willingness to make moral judgments when fundamental human interests are at stake.

For related perspectives, see moral frameworks explained, what is critical thinking, ethical decision-making explained, and how values shape decisions.

References and Further Reading

1. Benedict, R. (1934). Patterns of Culture. Houghton Mifflin.
2. Boas, F. (1911). The Mind of Primitive Man. Macmillan.
3. Rachels, J. (1986). The challenge of cultural relativism. In The Elements of Moral Philosophy. McGraw-Hill.
4. Nussbaum, M. C. (2000). Women and Human Development: The Capabilities Approach. Cambridge University Press.
5. Sen, A. (1999). Development as Freedom. Anchor Books.
6. Rawls, J. (1999). The Law of Peoples. Harvard University Press.
7. Mackie, J. L. (1977). Ethics: Inventing Right and Wrong. Penguin.
8. Singer, P. (1981). The Expanding Circle. Farrar, Straus and Giroux.
9. Parfit, D. (2011). On What Matters (Vols. 1-2). Oxford University Press.
10. Wong, D. B. (2006). Natural Moralities: A Defense of Pluralistic Relativism. Oxford University Press.
11. Moody-Adams, M. M. (1997). Fieldwork in Familiar Places: Morality, Culture, and Philosophy. Harvard University Press.
12. Pinker, S. (2011). The Better Angels of Our Nature. Viking.
13. Appiah, K. A. (2006). Cosmopolitanism: Ethics in a World of Strangers. W. W. Norton.
14. Shweder, R. A. (1991). Thinking Through Cultures: Expeditions in Cultural Psychology. Harvard University Press.
15. Ignatieff, M. (2001). Human Rights as Politics and Idolatry. Princeton University Press.
16. Herodotus (c. 440 BC). The Histories. Translated by A. de Selincourt, Penguin Classics (2003).
17. Eriksen, T. H. (2015). Small Places, Large Issues: An Introduction to Social and Cultural Anthropology (4th ed.). Pluto Press.