MacBird! is a 1966 satire by Barbara Garson. It was self-published ('Grassy Knoll Press') as a pamphlet, and the full text appeared in the December 1966 issue of Ramparts magazine. It was staged in February 1967.

The play superimposes the John F. Kennedy assassination onto the plot of Shakespeare's Macbeth.

The play burlesques Shakespeare's Macbeth, with lines drawn from other plays such as Hamlet, and Richard III, with Texas and Boston accents. The plot follows MacBird from the 1960 Democratic National Convention, when he becomes John Ken O'Dunc's Vice President ("Hail, Vice-President thou art!"), to Ken O'Dunc's assassination, at the urging of Lady MacBird. Robert Ken O'Dunc then defeats MacBird at the 1968 convention.

In the play, Kennedy becomes "John Ken O'Dunc", Lyndon Johnson becomes "MacBird", Lady Bird Johnson becomes "Lady MacBird", etc. As Macbeth assassinates Duncan, so MacBird assassinates Ken O'Dunc. As Macbeth is defeated by Macduff, so MacBird is defeated by Robert Ken O'Dunc (Robert F. Kennedy).

The play also features the Three Witches, in the form of a student radical, a Nation of Islam member, and a working-class union member. The recently deceased Adlai Stevenson II was depicted as 'The Egg of Head' (the term 'egghead' having been coined in the 1950s to describe intellectual supporters of Stevenson).

In a 2006 Washington Post interview, Garson said she was not seriously accusing Johnson of being complicit in the Kennedy assassination:

"People used to ask me then, 'Do you really think Johnson killed Kennedy?'" Garson, when she was 65, recalls. "I never took that seriously. I used to say to people, 'If he did, it's the least of his crimes.' It was not what the play was about. The plot was a given."

Macbird! began as a short satirical sketch by Garson, a recent graduate of the anti-Vietnam war movement at University of California, Berkeley. She developed the piece into a full-length play with help from writer/director Roy Levine.