---
title: "Moral Non-Naturalism | Ethics"
description: "Moral non-naturalism says moral facts are real but not reducible to natural facts, so ethics treats them as objective truths in Ethics."
canonical: "https://fiveable.me/ethics/key-terms/moral-non-naturalism"
type: "key-term"
subject: "Ethics"
unit: "Unit 12"
---

# Moral Non-Naturalism | Ethics

## Definition

Moral non-naturalism is the view that moral facts exist, but they are not the same as scientific or psychological facts. In Ethics, it says statements like “lying is wrong” can be true without being reducible to natural properties.

## What It Is

Moral non-naturalism is a theory in Ethics that says moral properties, like wrongness, goodness, or fairness, are real but not made out of natural facts. So if you say “cruelty is wrong,” the claim is not just describing a behavior, a feeling, or a biological process. It is making a moral claim that has its own kind of truth.

That is the big move of non-naturalism. It agrees with cognitivism that moral statements can be true or false, but it rejects the idea that those truths can be fully explained by science, psychology, or other natural facts. You cannot reduce “wrong” to “causes pain,” “is disliked by most people,” or “violates a social rule.” Those may matter, but they do not capture the moral property itself.

This is why non-naturalists often say moral truths are known in a special way, sometimes through rational reflection or moral intuition. G. E. Moore is the classic name here. He argued that trying to define “good” in purely natural terms commits a mistake, because morality has a quality that does not collapse into any observable feature of the world.

In an Ethics class, this view shows up when you compare what morality is about. If a theory says moral facts are independent of human opinions and not identical to empirical facts, it pushes you toward the idea that ethics is discovering something objective, not just reporting preferences. That makes moral non-naturalism close to moral realism, but more specific about what moral facts are made of.

A useful way to think about it is this: naturalism tries to explain morality using facts you could study in psychology, biology, or sociology. Non-naturalism says that explanation leaves something out. The moral fact is still real, but it sits above the natural description rather than inside it.

## Why It Matters

Moral non-naturalism matters because it changes how you read moral arguments in Ethics. If a philosopher thinks moral facts are non-natural, then disagreement about right and wrong is not just a clash of preferences or cultural habits. It is a disagreement about an objective moral truth that people may be missing, distorting, or reasoning about poorly.

This helps you make sense of why some ethical theories insist that morality cannot be reduced to what people happen to want, approve of, or observe in the world. It also gives you a framework for analyzing debates over whether moral language is describing facts or just expressing attitudes. When a class discussion asks whether “murder is wrong” is true in the same way “water boils at 100°C” is true, non-naturalism gives one side of that argument.

It also comes up when you compare moral theory with science. A student might be tempted to say that if something can be measured, it can settle every ethical question. Non-naturalism pushes back and says moral reasoning still needs philosophical justification, not only data. That distinction matters in essays about cruelty, justice, honesty, or human rights, where natural facts alone do not seem to settle the issue.

## Connections

### Cognitivism

Moral non-naturalism is usually a cognitivist view, which means it treats moral statements as truth-apt. The difference is that cognitivism only says moral claims can be true or false, while non-naturalism adds that those truths are not reducible to natural facts. So if you see a sentence like “stealing is wrong,” cognitivism says it can be evaluated for truth, and non-naturalism explains what kind of truth that is.

### Moral Realism

Moral non-naturalism is one version of moral realism, because both hold that moral facts are objective and not just personal opinion. The extra part in non-naturalism is the claim that moral facts are not natural facts. So all non-naturalists are moral realists in the broad sense, but not all moral realists are non-naturalists.

### Naturalism

Naturalism is the main contrast term here. A naturalist tries to explain morality using facts about human nature, wellbeing, desire, or social life. A non-naturalist says that move leaves moral reality incomplete. When you compare the two in class, the question is whether ethics can be grounded entirely in the natural world.

### [Moral Claims](/ethics/key-terms/moral-claims)

Moral claims are the statements that moral non-naturalism is trying to explain. If a claim like “cheating is unfair” is more than an emotional reaction, then the non-naturalist says it refers to a genuine moral property. That makes the way you analyze the sentence matter, because you are not just checking tone or opinion.

## On the AP Exam

A short-answer question may ask you to identify whether a moral statement is being treated as a factual claim or an expression of attitude. In that case, you would use moral non-naturalism to explain that the statement is truth-apt and that its truth does not reduce to a scientific or psychological fact. In an essay, you might use it to compare views on whether morality can be explained by biology, culture, or reason alone.

If you get a case about lying, fairness, or cruelty, the move is to ask what makes the act wrong on this view. A strong response will show that non-naturalism treats moral properties as objective but not empirically observable. You can also use it to explain why two people can disagree morally even when they share the same facts about the situation.

## moral non-naturalism vs Moral Naturalism

These are easy to mix up because both are forms of moral realism, and both say moral claims can be true or false. The difference is that moral naturalism tries to ground moral facts in natural facts, while moral non-naturalism says moral facts are not reducible to nature, science, or psychology.

## Key Takeaways

- Moral non-naturalism says moral facts are real, but they are not the same as scientific or psychological facts.
- The view treats moral claims as truth-apt, so statements like “lying is wrong” can be true or false.
- It rejects the idea that you can fully define moral terms like “good” or “wrong” in natural terms.
- G. E. Moore is the classic philosopher linked to this view, especially in arguments against reducing goodness to anything natural.
- In Ethics, this theory helps you explain why moral disagreement is not just a difference in taste or preference.

## FAQs

### What is moral non-naturalism in Ethics?

Moral non-naturalism is the view that moral facts exist, but they are not reducible to natural facts like biology, psychology, or social behavior. It says moral statements can be true or false, yet their truth is not something science can fully capture. In class, it usually comes up when you are comparing theories of what moral language is doing.

### Is moral non-naturalism the same as moral realism?

Not exactly. Moral non-naturalism is a type of moral realism, because it says moral truths are objective and not just opinions. But it adds a stronger claim: those truths are non-natural, so they cannot be fully explained by natural properties alone.

### How is moral non-naturalism different from moral naturalism?

Moral naturalism tries to explain moral truths using natural facts, such as wellbeing, desire satisfaction, or human flourishing. Moral non-naturalism says that reduction leaves something out, because moral properties are not identical to natural properties. That is the main comparison teachers usually want you to make.

### What is an example of moral non-naturalism?

If someone says “torturing animals is wrong” and means that this wrongness is an objective moral property, not just a social rule or a feeling of disgust, that fits moral non-naturalism. The view says the wrongness is real even though you cannot measure it the way you measure temperature or brain activity.

## Related Study Guides

- [12.2 Cognitivism and Non-Cognitivism in Ethics](/ethics/unit-12/cognitivism-non-cognitivism-ethics/study-guide/QwW1cH4m1K16AsqD)

## About This Document

Canonical Fiveable pages are available as Markdown at the same path plus `.md`.

- [llms.txt](https://fiveable.me/llms.txt): index of Fiveable's sections and URL patterns
- [llms-full.txt](https://fiveable.me/llms-full.txt): complete subject and unit listing
- [MCP server](https://fiveable.me/mcp): call Fiveable as tools instead of fetching pages (`https://fiveable.me/api/mcp`)
- [MCP server for AP teachers](https://fiveable.me/mcp/teachers): a teacher's classes, assignments and AP-rubric grading (`https://fiveable.me/api/mcp/teacher`)

## Structured Data

```json
{"@context":"https://schema.org","@graph":[{"@type":"LearningResource","@id":"https://fiveable.me/ethics/key-terms/moral-non-naturalism#resource","name":"Moral Non-Naturalism | Ethics","url":"https://fiveable.me/ethics/key-terms/moral-non-naturalism","learningResourceType":"Concept explainer","educationalLevel":"AP® / High School","about":{"@id":"https://fiveable.me/ethics/key-terms/moral-non-naturalism#term"},"audience":{"@type":"EducationalAudience","educationalRole":"student"},"dateModified":"2026-07-03T02:21:18.603Z","isPartOf":{"@type":"Collection","name":"Ethics Key Terms","url":"https://fiveable.me/ethics/key-terms"},"author":{"@type":"Organization","@id":"https://fiveable.me/editorial#content-team","name":"Fiveable Content Team","url":"https://fiveable.me/editorial","parentOrganization":{"@id":"https://fiveable.me/#organization"},"member":[{"@type":"Person","name":"Amanda DoAmaral","sameAs":["https://www.linkedin.com/in/adoamaral"]},{"@type":"Person","name":"Becky Bahr","sameAs":["https://www.linkedin.com/in/becky-bahr-b52743132"]}]},"publisher":{"@type":"Organization","name":"Fiveable","url":"https://fiveable.me"}},{"@type":"DefinedTerm","@id":"https://fiveable.me/ethics/key-terms/moral-non-naturalism#term","name":"moral non-naturalism","description":"Moral non-naturalism is the view that moral facts exist, but they are not the same as scientific or psychological facts. In Ethics, it says statements like “lying is wrong” can be true without being reducible to natural properties.","url":"https://fiveable.me/ethics/key-terms/moral-non-naturalism","inDefinedTermSet":{"@type":"DefinedTermSet","name":"Ethics Key Terms","url":"https://fiveable.me/ethics/key-terms"}},{"@type":"FAQPage","mainEntity":[{"@type":"Question","name":"What is moral non-naturalism in Ethics?","acceptedAnswer":{"@type":"Answer","text":"Moral non-naturalism is the view that moral facts exist, but they are not reducible to natural facts like biology, psychology, or social behavior. It says moral statements can be true or false, yet their truth is not something science can fully capture. In class, it usually comes up when you are comparing theories of what moral language is doing."}},{"@type":"Question","name":"Is moral non-naturalism the same as moral realism?","acceptedAnswer":{"@type":"Answer","text":"Not exactly. Moral non-naturalism is a type of moral realism, because it says moral truths are objective and not just opinions. But it adds a stronger claim: those truths are non-natural, so they cannot be fully explained by natural properties alone."}},{"@type":"Question","name":"How is moral non-naturalism different from moral naturalism?","acceptedAnswer":{"@type":"Answer","text":"Moral naturalism tries to explain moral truths using natural facts, such as wellbeing, desire satisfaction, or human flourishing. Moral non-naturalism says that reduction leaves something out, because moral properties are not identical to natural properties. That is the main comparison teachers usually want you to make."}},{"@type":"Question","name":"What is an example of moral non-naturalism?","acceptedAnswer":{"@type":"Answer","text":"If someone says “torturing animals is wrong” and means that this wrongness is an objective moral property, not just a social rule or a feeling of disgust, that fits moral non-naturalism. The view says the wrongness is real even though you cannot measure it the way you measure temperature or brain activity."}}]},{"@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Ethics","item":"https://fiveable.me/ethics"},{"@type":"ListItem","position":2,"name":"Key Terms","item":"https://fiveable.me/ethics/key-terms"},{"@type":"ListItem","position":3,"name":"Unit 12","item":"https://fiveable.me/ethics/unit-12"},{"@type":"ListItem","position":4,"name":"moral non-naturalism"}]}]}
```