Torii Mototada (鳥居 元忠^?, 1539 – September 8, 1600) was a Japanese samurai of the Sengoku period through late Azuchi-Momoyama Period, who served Tokugawa Ieyasu. Torii died at the siege of Fushimi where his garrison was greatly outnumbered and destroyed by the army of Ishida Mitsunari. Torii's refusal to surrender changed the course of Japanese history; the fall of Fushimi bought Ieyasu some time to regroup and eventually win the Battle at Sekigahara.

Torii was born in Okazaki, the son of Torii Tadayoshi. As a boy, he was sent as hostage to the Imagawa clan, together with the future Tokugawa Ieyasu. The young Mototada served the then-Matsudaira Takechiyo as a page. After Ieyasu's return from the Imagawa clan, and his unification of Mikawa Province, Mototada served as one of his chief generals.

In 1572, Mototada succeeded the Torii family headship, following the death of his father. He fought at the Battle of Mikata-ga-hara and Battle of Suwahara Castle the following year and was wounded in the legs, which rendered walking difficult for him from then on.