The Saturn Award for Best Actor is an award presented annually by the Academy of Science Fiction, Fantasy & Horror Films to honor the top works in science fiction, fantasy, and horror in film, television, and home video. The Saturn Awards were devised by Dr. Donald A. Reed, who felt that films within those genres were never given the appreciation they deserved. The physical award is a representation of the planet Saturn, surrounded with a ring of film. The award was initially and is still sometimes loosely referred to as a Golden Scroll. The award for Best Actor was first introduced in 1976 for the 1974 and 1975 years, to reward a lead performance by a male actor in film.

The record for most awards is held by Robert Downey Jr. with four wins, followed by Mark Hamill and Harrison Ford with three, and then Jeff Bridges and Tom Cruise with two each. Cruise is the most nominated actor in the category with twelve nominations, followed by Ford, Downey, Jr. and Arnold Schwarzenegger with seven. Schwarzenegger holds the record for most nominations without a victory. Anthony Hopkins and Martin Landau are the only actors to have won the Saturn Award for Best Actor and an Academy Award for the same role; however, Landau won the Academy Award for Best Supporting Actor and not Best Actor. The record for most wins for playing a same character is held by Downey Jr. and Hamill, who both won three times for playing Tony Stark and Luke Skywalker respectively.

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