Dougal McAngus, 4th Duke of Argyll is a fictional character in the first series of the British sitcom Blackadder. The character was played by Alex Norton.

The character appears in the episode "Born to be King". He is Supreme Commander of the King's Army and the Fourth Duke of Argyll. Upon his return from a crusade against the Turks, he is rewarded for his bravery with Prince Edmund's Scottish lands. Enraged, Edmund schemes to have him stabbed on stage during the entertainment.

He changes his mind about the assassination attempt after McAngus shows him documents that McAngus at first suggests show Edmund's brother, Harry, is illegitimate; he claims his father Donald, the 3rd Duke, had a liaison with Queen Gertrude of Flanders nine months before Harry's birth. Unfortunately for Edmund, the documents prove the Queen's adultery took place nine months before Edmund's birth, not Harry's, showing that McAngus knew all along that he was Edmund's possible half-brother and intended to humiliate him. Edmund destroys the evidence and persuades McAngus to inspect a cannon, which then "accidentally" fires.