Theory of population

Theory of population may refer to:


 * Malthusianism, a theory of population by Thomas Malthus (1766–1834)
 * An Essay on the Principle of Population, the book in which Malthus propounded his theory
 * Neo-Malthusian theory of Paul R. Ehrlich (born 1932) and others
 * Theory of demographic transition by Warren Thompson (1887–1973)