Blackadder the Third  is the third series of the BBC sitcom Blackadder, written by Richard Curtis and Ben Elton, which aired from 17 September to 22 October 1987. The series is set during the Georgian Era, and sees the principal character, Mr. E. Blackadder, serve as butler to the Prince Regent and have to contend with, or cash in on, the fads of the age embraced by his master.

Blackadder is a series of four period British sitcoms, plus several one-off instalments, which originally aired on BBC1 from 1983 to 1989. All television episodes starred Rowan Atkinson as the antihero Edmund Blackadder and Tony Robinson as Blackadder's dogsbody, Baldrick. Each series was set in a different historical period, with the two protagonists accompanied by different characters, though several reappear in one series or another, e.g., Melchett, Lord Percy Percy / Captain Darling and George.