L
- Simon Lack
- Professor Kettering, The Mind of Evil (1971)
- Zadek, The Androids of Tara (1978)
- Jenny Laird
- Neska, Planet of the Spiders (1974)
- Trevor Laird
- Frax, Mindwarp (1986)
- Clive Jones: "Smith and Jones", "The Sound of Drums" - "Last of the Time Lords" (2007)
- Alan Lake
- Herrick, Underworld (1978)
- Annie Lambert
- Enlightenment, Four to Doomsday (1982)
- Nigel Lambert
- Hardin, The Leisure Hive (1980)
- Duncan Lamont
- Dan Galloway, Death to the Daleks (1974)
- Sarah Lancashire
- Miss Foster (Matron Cofelia), "Partners in Crime" (2008)
- Dinsdale Landen
- Dr. Judson, The Curse of Fenric (1989)
- Jackie Lane
- Companion Dodo Chaplet, The Massacre of St Bartholomew's Eve - The War Machines (1966)
- Howard Lang
- Horg, An Unearthly Child (1963)
- Bruno Langley
- Companion Adam Mitchell, "Dalek" - "The Long Game" (2005)
- Bonnie Langford
- Melanie Bush, The Trial of a Time Lord: Terror of the Vervoids (1986) - Dragonfire (1987)
- Philip Latham
- Lord President Borusa, The Five Doctors (1983)
- Jon Laurimore
- Count Federico, The Masque of Mandragora (1976)
- George Layton
- Technician Penn, The Space Pirates (1969)
- Sylvestra Le Touzel
- Child, The Mind Robber (1968)
- John Lee
- Alydon, The Daleks (1963–1964)
- Richard Leech
- Gatherer Hade, The Sun Makers (1977)
- John Leeson
- Voice of K-9: The Invisible Enemy (1977) - The Armageddon Factor (1979), The Leisure Hive (1980) - Warriors' Gate (1981), The Five Doctors (1983), "School Reunion" (2006), "Journey's End" (2008)
- Daleks, Remembrance of the Daleks (1988)
- Beatrix Lehmann
- Professor Emilia Rumford, The Stones of Blood (1978)
- Ronald Leigh-Hunt
- Radnor, The Seeds of Death (1969)
- Commander Stevenson, Revenge of the Cybermen (1975)
- Tutte Lemkow
- Kuiju, Marco Polo (1964)
- Ibrahim, The Crusade (1965)
- Cyclops, The Myth Makers (1965)
- Angus Lennie
- Storr, The Ice Warriors (1967)
- Angus, Terror of the Zygons (1975)
- Rula Lenska
- Styles, Resurrection of the Daleks (1984)
- John Levene
- Yeti, The Web of Fear (1968)
- Sergeant Benton, The Invasion (1968), The Ambassadors of Death (1970) - The Claws of Axos, The Dæmons (1971), Day of the Daleks, The Time Monster (1972), The Three Doctors, The Green Death, Invasion of the Dinosaurs (1973), Planet of the Spiders (1974), Robot (1974–1975), Terror of the Zygons, The Android Invasion (1975)
- Denis Lill
- Dr. Fendleman, Image of the Fendahl (1977)
- Sir George Hutchinson, The Awakening (1984)
- Pik-Sen Lim
- Chin Lee, The Mind of Evil (1971)
- Kevin Lindsay
- Linx, The Time Warrior (1973-4)
- Cho-je, Planet of the Spiders (1974)
- Field Major Styre/The Marshal, The Sontaran Experiment (1975)
- William Lindsay
- Zargo, State of Decay (1980)
- Maureen Lipman
- The Wire, "The Idiot's Lantern" (2006)
- Raymond Llewellyn
- Sapan, The Abominable Snowmen (1967)
- Roger Lloyd Pack
- John Lumic, "Rise of the Cybermen" - "The Age of Steel" (2006)
- Harry Lloyd
- Jeremy Baines/Son of Mine, "Human Nature" - "The Family of Blood" (2007)
- Hugh Lloyd
- Goronwy Jones, Delta and the Bannermen (1987)
- Rosalind Lloyd
- The Nurse, The Pirate Planet (1978)
- Philip Locke
- Bigon, Four to Doomsday (1982)
- Preston Lockwood
- Dojjen, Snakedance (1983)
- Crawford Logan
- Deedrix, Meglos (1980)
- Ray Lonnen
- Gardiner, Frontier in Space (1973)
- Jennifer Lonsdale
- Della, Nightmare of Eden (1979)
- William Lucas
- Range, Frontios (1984)
- Cyril Luckham
- The Guardian, The Ribos Operation (1978)
- The White Guardian, Enlightenment (1983)
- Reg Lye
- Griffin the Chef, The Enemy of the World (1968)
- Alfred Lynch
- Commander Millington, The Curse of Fenric (1989)
Read more about this topic: List Of Doctor Who Cast Members