In ethical philosophy, rational egoism (also called rational selfishness or egotism) is the principle that an action is rational if and only if it maximizes one's self-interest. The view is a normative form of egoism. However, it is different from other forms of egoism, such as ethical egoism and psychological egoism. While psychological egoism is about motivation and ethical egoism is about morality, rational egoism is a view about rationality (where rationality may or may not be tied to morality). Ethical egoism is also different from amoralism.

Rational egoism is discussed by the nineteenth-century English philosopher Henry Sidgwick in The Methods of Ethics. A method of ethics is "any rational procedure by which we determine what individual human beings 'ought' – or what it is 'right' for them – to do, or seek to realize by voluntary action". Sidgwick considers three such procedures, namely, rational egoism, dogmatic intuitionism, and utilitarianism. Rational egoism is the view that, if rational, "an agent regards quantity of consequent pleasure and pain to himself alone important in choosing between alternatives of action; and seeks always the greatest attainable surplus of pleasure over pain".

Ayn Rand ( /ˈaɪn ˈrænd/; born Alisa Zinov'yevna Rosenbaum, February 2 [O.S. January 20] 1905 – March 6, 1982) was a Russian-American novelist, philosopher, playwright, and screenwriter. She is known for her two best-selling novels The Fountainhead and Atlas Shrugged and for developing a philosophical system she called Objectivism.

Born and educated in Russia, Rand moved to the United States in 1926. She worked as a screenwriter in Hollywood and had a play produced on Broadway in 1935–1936. After two initially unsuccessful early novels, she achieved fame with her 1943 novel The Fountainhead. In 1957, she published her best-known work, the philosophical novel Atlas Shrugged. Afterward she turned to nonfiction to promote her philosophy, publishing her own magazines and releasing several collections of essays until her death in 1982.

Rand advocated reason as the only means of acquiring knowledge and rejected all forms of faith and religion. She supported rational and ethical egoism, and rejected ethical altruism. In politics, she condemned the initiation of force as immoral and opposed all forms of collectivism and statism, instead supporting laissez-faire capitalism, which she believed was the only social system that protected individual rights. She promoted romantic realism in art. She was sharply critical of the philosophers and philosophical traditions known to her besides Aristotle.