Tadashi Imai was a Japanese film director known for social realist filmmaking informed by a left-wing perspective. His most noted films include An Inlet of Muddy Water (1953) and Bushido, Samurai Saga (1963).

An Inlet of Muddy Water, also titled Muddy Waters, is a 1953 Japanese drama film directed by Tadashi Imai. Based on three short stories by Ichiyō Higuchi, it received numerous national film prizes and is regarded as a major work of Imai by film historians.