Ethics

Introduction & Top Questions
The origins of ethics
- Mythical accounts
  - Introduction of moral codes
  - Problems of divine origin
- Prehuman ethics
  - Nonhuman behaviour
  - Kinship and reciprocity
- Anthropology and ethics
The history of Western ethics
- Ancient civilizations to the end of the 19th century
  - The ancient Middle East and Asia
    - The Middle East
    - India
    - China
  - Ancient and Classical Greece
    - Ancient Greece
    - Socrates
    - Plato
    - Aristotle
  - Later Greek and Roman ethics
    - The Stoics
    - The Epicureans
  - Christian ethics from the New Testament to the Scholastics
    - Ethics in the New Testament
    - St. Augustine
    - St. Thomas Aquinas and the Scholastics
  - The Renaissance and the Reformation
    - Machiavelli
    - The first Protestants
  - The British tradition from Hobbes to the utilitarians
    - Hobbes
    - Early intuitionists: Cudworth, More, and Clarke
    - Shaftesbury and the moral sense school
    - Butler on self-interest and conscience
    - The climax of moral sense theory: Hutcheson and Hume
    - The intuitionist response: Price and Reid
    - Utilitarianism
      Paley
      Bentham
      Mill
      Sidgwick
  - The Continental tradition from Spinoza to Nietzsche
    - Spinoza
    - Leibniz
    - Rousseau
    - Kant
    - Hegel
    - Marx
    - Nietzsche
- Western ethics from the beginning of the 20th century
  - Metaethics
    - Moore and the naturalistic fallacy
    - Modern intuitionism
    - Emotivism
    - Existentialism
    - Universal prescriptivism
    - Later developments in metaethics
      Moral realism
      Kantian constructivism: a middle ground?
      Irrealist views: projectivism and expressivism
      Ethics and reasons for action
  - Normative ethics
    - The debate over consequentialism
    - Varieties of consequentialism
    - Objections to consequentialism
    - An ethics of prima facie duties
    - Rawls’s theory of justice
    - Rights theories
    - Natural law ethics
    - Virtue ethics
    - Feminist ethics
    - Ethical egoism
  - Applied ethics
    - Equality
    - Animals
    - Environmental ethics
    - War and peace
    - Abortion, euthanasia, and the value of human life
    - Bioethics

References & Edit History Quick Facts & Related Topics

Images & Videos

Marble bust of Pythagoras, the ancient Greek mathematician and philosopher, showing a bearded man with a head covering and calm expression.

At a Glance

ethics summary

Ethics

philosophy

Also known as: moral philosophy

Written by

Peter Singer

Fact-checked by

Britannica Editors

Last updated

Nov. 1, 2026 •History

Ethics, the discipline concerned with what is morally good and bad and morally right and wrong. The term is also applied to any system or theory of moral values or principles. (Read Britannica’s biography of this author, Peter Singer.) How should we live? Shall we aim at happiness or at knowledge, virtue, or the creation of beautiful objects? If we choose happiness, will it be our own or the happiness of all? And what of...

Discover the world with Britannica

Subscribe to Continue Reading

Free Trial | No Ads | Exclusive Content

Explore Subscriptions

Ethics

Subscribe to Continue Reading

Thank you for signing up!