Satan Junior is a 1919 American silent comedy film, directed by Herbert Blaché and John H. Collins. It was Collins' final involvement in film. Collins began directing the film, production of which had to be suspended due to the flu epidemic of 1918. Collins contracted the flu and died in 1918. When production resumed, Blaché took over directing duties. It stars Viola Dana (Collins' wife), Milton Sills, and Lila Leslie, and was released on March 3, 1919.