Series with the first letter - "S"
- Second to Last Love (2016)
- Secret Agent (1964–1967)
- Secret Army (1977–1979)
- Secret City (2016–2018)
- Secret Diary of a Call Girl (2007–2011)
- Secret Garden (2010–2011)
- Secret Invasion (2023)
- Secret Love Affair (2014)
- Secret Royal Inspector Joy (2021–…)
- Secret State (2012–…)
- Secrets (2013–…)
- Secrets & Lies (2014–…)
- Secrets and Lies (2015–2016)
- Secrets in the Ice (2020–…)
- Secrets of Great British Castles (2015–…)
- Secrets of Sulphur Springs (2021–…)
- Secrets of Summer (2022–…)
- Secrets of the Castle (2014)
- Secrets of the Dead (2000–…)
- Secrets of the SAS: In Their Own Words (2016–…)
- Secrets of the Universe (2022–…)
- Secrets of Wild Australia (2016)
- Seduced: Inside the NXIVM Cult (2020–…)
- See (2019–…)
- See No Evil (2014–…)
- See You in My 19th Life (2023–…)
- Sefirin Kizi (2019–…)
- Segodon (2018–…)
- Seigi no mikata (2008–…)
- Seinfeld (1989–1998)