This article lists the characters (and the actors who played them) in the four series and three special episodes of the British sitcom Blackadder.

Blackadder was notable for featuring many repeating characters and actors, particularly Rowan Atkinson as the eponymous protagonist, Edmund Blackadder, and Tony Robinson as his sidekick Baldrick, together with numerous actors in one-off parts:

• Edmund Blackadder; Ebeneezer Blackadder (Rowan Atkinson)
• Sod-off Baldrick (a dim and ragged dogsbody), Alsatian (Tony Robinson)
• Lord Percy Percy; Captain Kevin Darling; Lord Topper and "Le Comte de Frou Frou "; Archdeacon Darling; Duke of Darling; Duc de Darling (Tim McInnerny)
• Queen Elizabeth I; Amy Hardwood; Nurse Fletcher-Brown; Queen Asphyxia; Lady Elizabeth (Miranda Richardson)
• Prince George; Lieutenant The Honourable George Colthurst St. Bartleigh; Prince Ludwig; Prince Pigmot; Farters Parters; Viscount George Bufton-Tufton; Georgius (Hugh Laurie)
• Lord Melchett; General Sir Anthony Cecil Hogmanay Melchett; The Duke of Wellington; Lord Frondo; King Charles I; Bishop Flavius Melchett; General Melchecus (Stephen Fry)
• Nursie (Patsy Byrne)
• King Richard IV of England (Brian Blessed)
• Queen Gertrude of Flanders (Elspet Gray )
• Prince Harry of Wales (Robert East)
• Lord Flashheart; Mad Gerald; Robin Hood (Rik Mayall)
• Baron von Richthofen a.k.a. Red Baron (Adrian Edmondson)
• Bob/Kate; Corporal Bobbie Parkhurst (Gabrielle Glaister)
• Lord Smedley and "Madame Guillotine " (Nigel Planer)
• Firing squad - Sergeant Jones and Privates Fraser, Robinson and Tipplewick (Stephen Frost, Lee Cornes , Paul Mark Elliot , Jeremy Gittins )
• George de Beouf; Gaoler Ploppy; General Bernard Proudfoot-Smith (Bill Wallis )
• Mrs. Ploppy (Linda Polan )
• Vincent Hanna's own great-great-great-grandfather
• Samuel Johnson; the spirit of Christmas (Robbie Coltrane)
• Mrs. Miggins (Helen Atkinson-Wood)
• Evil Revolutionary (Chris Barrie)
• Wise woman of Putney heath (Barbara Miller )
• Mad Beggar , Minstrel (Tom Aitken )
• Captain Redbeard Rum (Tom Baker)
• Richard III (Peter Cook)
• Mr. Hardwood, Oliver Cromwell (Warren Clarke )
• King George III (Gertan Klauber )
• Sir Walter Raleigh (Simon Jones)
• Witchsmeller Pursuivant (Frank Finlay)
• Princess Leia of Hungary (Natasha King )
• Isabella (ugly Spanish infanta), Lady Whiteadder, Victoria of the United Kingdom (Miriam Margolyes)
• Interpreter, Prince Albert (Jim Broadbent)
• Lord Whiteadder (Daniel Thorndike )
• Mollie (Cassie Stuart )
• Keanrick (an actor in Sense and Senility) (Hugh Paddick)
• Mossop (another actor in Sense and Senility) (Kenneth Connor)
• Sir Talbot Buxomly (Denis Lill )
• Pitt the Younger (Simon Osborne )
• Pitt the even Younger (Dominic Martelli )
• Ivor "Jest Ye Not Madam" Biggun (Geoffrey McGivern)
• An Anarchist (Ben Elton)
• Graeme the slug (himself)