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)
See also Demography Population Population growth Population bottleneck Population ecology