Findlay Ewing Russell (1 September 1919 – 21 August 2011) was an American internal medicine physician and toxicologist. He pursued a research interest in venomous and poisonous animals and the effects of toxins on the human nervous system and was widely acknowledged as one of the world's leading authorities on snakes and the pharmacology of snake venoms. Consulting work for the United Nations and various governmental agencies took him all over the world.