S
- Alec Sabin
- Ringway, Earthshock (1982)
- Leonard Sachs
- Admiral Gaspard de Coligny, The Massacre of St Bartholomew's Eve (1966)
- Lord President Borusa, Arc of Infinity (1983)
- Pamela Salem
- Xoanon Voice, The Face of Evil (1977)
- Toos, The Robots of Death (1977)
- Rachel Jenson, Remembrance of the Daleks (1988)
- Abdul Salis
- Kel, Fear Her (2006)
- Peter Sallis
- Penley, The Ice Warriors (1967)
- Colin Salmon
- Dr. Moon, "Silence in the Library"-"Forest of the Dead" (2008)
- Ivor Salter
- Morok Commander, The Space Museum (1965)
- Odysseus, The Myth Makers (1965)
- Sergeant Markham, Black Orchid (1982)
- Gian Sammarco
- Whizzkid, The Greatest Show in the Galaxy (1988–1989)
- Thomas Sangster
- Tim Latimer, "Human Nature"-"The Family of Blood" (2007)
- Will Sasso
- Pete, Doctor Who (1996 film) (1996)
- Nitza Saul
- Karina, Warriors of the Deep (1984)
- John Savident
- The Squire, The Visitation (1982)
- James Saxon
- Oscar, The Two Doctors (1985)
- Alexei Sayle
- DJ, Revelation of the Daleks (1985)
- Catherine Schell
- Countess, City of Death (1979)
- Katharine Schlesinger
- Gwendoline, Ghost Light (1989)
- Leslie Schofield
- Leroy, The War Games (1969)
- Calib, The Face of Evil (1977)
- Stefan Schwartz
- Knight Commander, Battlefield (1989)
- Tony Scoggo
- Grenville/Enzu, Terror of the Vervoids (1986)
- Terry Scully
- Fewsham, The Seeds of Death (1969)
- Paul Seed
- Graff Vynda-K, The Ribos Operation (1978)
- Zohra Sehgal
- Sheyrah, The Crusade (1965)
- Tony Selby
- Glitz, The Mysterious Planet (1986), The Ultimate Foe (1986) & Dragonfire (1987)
- George Selway
- Meadows, The Faceless Ones (1967)
- Renu Setna
- Intern, The Hand of Fear (1976)
- George Sewell
- Ratcliffe, Remembrance of the Daleks (1988)
- Nabil Shaban
- Sil, Vengeance on Varos (1985) & Mindwarp (1986)
- Cyril Shaps
- Viner, The Tomb of the Cybermen (1967)
- Lennox, The Ambassadors of Death (1970)
- Professor Clegg, Planet of the Spiders (1974)
- Archimandrite, The Androids of Tara (1978)
- Madhav Sharma
- Patel, Frontier in Space (1973)
- Michael Sheard
- Rhos, The Ark (1966)
- Dr. Summers, The Mind of Evil (1971)
- Laurence Scarman, Pyramids of Mars (1975)
- Lowe, The Invisible Enemy (1977)
- Mergrave, Castrovalva (1982)
- Headmaster, Remembrance of the Daleks (1988)
- Doug Sheldon
- Kirksen, The Daleks' Master Plan (1965)
- Barbara Shelley
- Sorasta, Planet of Fire (1984)
- Paul Shelley
- Persuasion, Four to Doomsday (1982)
- Mark Sheppard
- Canton Delaware, "The Impossible Astronaut" and "Day of the Moon" (both 2011)
- W. Morgan Sheppard
- Old Canton Delaware, "The Impossible Astronaut" and "The Wedding of River Song" (both 2011)
- Dinah Sheridan
- Chancellor Flavia, The Five Doctors (1983)
- Jane Sherwin
- Lady Jennifer Buckingham, The War Games (1969)
- David Sibley
- Pralix, The Pirate Planet (1978)
- Adele Silva
- Squeak, Survival (1989)
- Carmen Silvera
- Clara / Queen of Hearts / Mrs Wiggs, The Celestial Toymaker (1966)
- Ruth, Invasion of the Dinosaurs (1974)
- David Simeon
- Private Latimer, Inferno (1970)
- Alastair Fergus, The Dæmons (1971)
- John Simm
- The Master/Harold Saxon, Utopia (2007), The Sound of Drums (2007), Last of the Time Lords (2007), The End of Time (2009–2010)
- William Simons
- Mandrel, The Sun Makers (1977)
- Graham Simpson
- Hiker, Image of the Fendahl (1977)
- Joan Sims
- Katryca, The Mysterious Planet (1986)
- Guy Siner
- Ravon, Genesis of the Daleks (1975)
- Campbell Singer
- Joey / King of Hearts / Sergeant Rugg, The Celestial Toymaker (1966)
- Roy Skelton
- Monoids (voices), The Ark (1966)
- Cybermen (voices), The Tenth Planet (1966)
- Control Technician (voice) (Uncredited), The Tenth Planet (1966)
- Daleks (voices), The Evil of the Daleks (1967)
- Computer (voice), The Ice Warriors (1967)
- Cyberman (voice), The Wheel in Space (1968)
- Kroton, (voice), The Krotons (1968/1969)
- Norton, Colony in Space (1971)
- Wester/Daleks (voices), Planet of the Daleks (1973)
- James, The Green Death (1973)
- Daleks (voices), Genesis of the Daleks (1975)
- Chedaki, The Android Invasion (1975)
- King Rokon, The Hand of Fear (1976)
- Daleks/K9 (voice), Destiny of the Daleks (1979)
- Daleks (voices), The Five Doctors (1983)
- Daleks (voices), Revelation of the Daleks (1985)
- Daleks (voices), Remembrance of the Daleks (1988)
- Keith Skinner
- Rondel, Vengeance on Varos (1985)
- Susan Skipper
- 'Heroine', The Armageddon Factor (1979)
- Elisabeth Sladen
- Sarah Jane Smith, The Time Warrior (1973) - The Hand of Fear (1976), The Five Doctors (1983), "School Reunion" (2006), The Stolen Earth (2008), Journey's End (2008), The End of Time (2010)
- Simon Slater
- Edwardes, Terror of the Vervoids (1986)
- Patsy Smart
- Ghoul, The Talons of Weng-Chiang (1977)
- Neville Smith
- D'Argenson, The Reign of Terror (1964)
- Nicholas Smith
- Wells, The Dalek Invasion of Earth (1964)
- Oliver Smith
- Drak, The Twin Dilemma (1984)
- Robin Soans
- Luvic, The Keeper of Traken (1981)
- Ewen Solon
- Chal, The Savages (1966)
- Vishinsky, Planet of Evil (1975)
- Nina Sosanya
- Trish, "Fear Her" (2006)
- Colin Spaull
- Lilt, Revelation of the Daleks (1985)
- Mr Crane, "Rise of the Cybermen" (2006), "The Age of Steel" (2006)
- Steve Speirs
- Strickland, "Aliens of London"-"World War Three" (2005)
- Roy Spencer
- Manyak, The Ark (1966)
- Harris, Fury from the Deep (1968)
- David Spenser
- Thonmi, The Abominable Snowmen (1967)
- Michael Spice
- Voice of Morbius, The Brain of Morbius (1976)
- Weng-Chiang, The Talons of Weng-Chiang (1977)
- Elizabeth Spriggs
- Tabby, Paradise Towers (1987)
- William Squire
- The Shadow, The Armageddon Factor (1979)
- Peter Stephens
- Knave of Hearts/Kitchen Boy/Cyril, The Celestial Toymaker (1966)
- Lolem, The Underwater Menace (1967)
- Jeff Stewart
- Dukkha, Kinda (1982)
- Roy Stewart
- Toberman, The Tomb of the Cybermen (1967)
- Strong Man, Terror of the Autons (1971)
- Colin Stinton
- President Arthur Coleman Winters, The Sound of Drums (2007)
- Nigel Stock
- Professor Hayter, Time-Flight (1982)
- Jo Stone-Fewings
- Male Computer Programmer, "Bad Wolf" (2005), "Parting of the Ways" (2005)
- Kevin Stoney
- Mavic Chen, The Daleks' Master Plan (1965/1966)
- Tobias Vaughan, The Invasion (1968)
- Tyrum, Revenge of the Cybermen (1975)
- Peter Straker
- Commander Sharrel, Destiny of the Daleks (1979)
- John Stratton
- Shockeye, The Two Doctors (1985)
- Mark Strickson
- Vislor Turlough, Mawdryn Undead (1983)-Planet of Fire (1984) The Caves of Androzani (1984) cameo - regeneration sequence.
- Michael Summerton
- Dalek, The Daleks (1963/1964)
- Donald Sumpter
- Enrico Casali, The Wheel in Space (1968)
- Commander Ridgeway, The Sea Devils (1972)
- Sarah Sutton
- Companion Nyssa, The Keeper of Traken (1981) - Terminus (1983), The Caves of Androzani (1984) cameo - regeneration sequence.
- Clive Swift
- Jobel, Revelation of the Daleks (1985)
- Mr. Copper, "Voyage of the Damned" (2007)
- Sylvia Syms
- Mrs Pritchard, Ghost Light (1989)
Read more about this topic: List Of Doctor Who Cast Members