Leonid Fedorovich Bykov (Ukrainian: Леонід Федорович Биков, Russian: Леонид Фёдорович Быков; 11 December 1928, in Znamenka village, Artemivsk Okruha of Ukrainian SSR – 11 April 1979, in Kyiv Oblast of Ukraine, USSR) was a Soviet actor, film director, and script writer.

His other notable performances included Petya Mokin in Aleksandr Ivanovski's and Nadezhda Kosheverova's blockbuster comedy Tamer of Tigers (1955) and in the title role of Maksim Perepelitsa (1956).

Bykov also appeared as a hopeless romantic in films such as Yuri Egorov's Volunteers (1958), Stanislav Rostotskii's May Stars (1961), and Iosif Kheifits's My Dear Man (1958).

As a director, Bykov debuted at Lenfilm Studio in 1962 with the 10-minute satire However the Rope Is Twisted (co-directed by Gerbert Rappaport), which skewered absurdities of the Soviet economy.

His most famous films as director are World War II dramas Only "Old Men" Are Going Into Battle (1974) and One-Two, Soldiers Were Going... (1977), in which he also starred.