Gethin Alderman Filmography
| 2025 | The War Between the Land and the Sea (TV Series) · as Homo Aqua |
| 2024 | Einstein and the Bomb · as Walther Nernst |
| 2023 | The Boys in the Boat · as Olympic Starter |
| 2023 | Doctor Who (2023) (TV Series) · as The Shreek |
| 2023 | The Winter King (TV Series) · as People Of Utter Darkness |
| 2023 | Wolf (2023) (TV Series) · as Minnet Kable |
| 2022 | Andor (TV Series) · as Executive Officer |
| 2022 | Somewhere Boy (TV Series) · as Monster |
| 2022 | The 355 · as Gendarme 1 |
| 2021 | The Outlaws (TV Series) · as Video Pap |
| 2020 | Ammonite · as Party Guest |
| 2020 | The Great (TV Series) · as Jean Pierre |
| 2000 | Doctors (TV Series) · as Stephen Payne |
| 1986 | Casualty (TV Series) · as Mike Rodriguez |
| 1985 | EastEnders (TV Series) · as Randall |
| 2023 | Doctor Who: Unleashed (TV Series) · as Self |