John Howard Moore (December 4, 1862 – June 17, 1916) was an American zoologist, philosopher, educator, humanitarian and socialist. He is considered to be an early, yet neglected, proponent of animal rights and ethical vegetarianism, and was a leading figure in the American humanitarian movement. Moore was a prolific writer, authoring numerous articles, books, essays, pamphlets on topics including animal rights, education, ethics, evolutionary biology, humanitarianism, socialism, temperance, utilitarianism and vegetarianism.