| Saturn Award for Best Supporting Actor on Television | |
| Awarded For: | Best performance of the year by a male in a supporting role in a genre television series |
| Presenter: | Academy of Science Fiction, Fantasy and Horror Films |
| Country: | United States |
| Year: | 1999 |
| Holder: | Jonathan Frakes for (2022/2023) |
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.
As of the 47th Saturn Awards in 2022, the award is known as Best Supporting Actor in a Network or Cable Television Series and features a sister category: Saturn Award for Best Supporting Actor in a Streaming Television Series.
(NOTE: Year refers to year of eligibility, the actual ceremonies are held the following year.)
The winners are listed in bold.
| Year | Actor | Television program | Network | Character |
|---|---|---|---|---|
| Dennis Haysbert | Now and Again | CBS | Dr. Theodore Morris | |
| Nicholas Brendon | Buffy the Vampire Slayer | The WB | Xander Harris | |
| Colm Feore | Storm of the Century | ABC | Andre Linoge | |
| Jeremy London | Journey to the Center of the Earth | USA Network | Jonas Lytton | |
| James Marsters | Buffy the Vampire Slayer | The WB | Spike | |
| Robert Picardo | UPN | The Doctor |