The Saturn Award for Best Supporting Actor on Television is presented annually by the Academy of Science Fiction, Fantasy and Horror Films, honoring the work of actors in science fiction, fantasy, and horror fiction on television.
Introduced at the 26th Saturn Awards inaugural recipient of the award was Dennis Haysbert for his role as Dr. Theodore Morris in Now and Again. In 2019 and 2022, the award was split into two Best Supporting Actor in a Network or Cable Television Series and Best Supporting Actor in a Streaming Television Series, but has since returned to one combined category. The most recent winner is Jonathan Frakes as William Riker in '. Aaron Paul has the most wins in the category, with three for his role as Jesse Pinkman on Breaking Bad, while Jonathan Banks, Dough Jones, and James Marsters each have two wins for Breaking Bad, ', and Buffy the Vampire Slayer respectively. Marsters and Michael Emerson hold the record for most nominations, with six. Kit Harington and Norman Reedus have the most nominations without a win, with four.
<small>(NOTE: Year refers to year of eligibility, the actual ceremonies are held the following year.)</small>
The winners are listed in bold.