Tomorrow and tomorrow and tomorrow is the beginning of the second sentence of one of the most famous soliloquies in Shakespeare's tragedy Macbeth. It takes place in the beginning of the 5th scene of Act 5, during the time when the English troops, led by Malcolm and Macduff, are approaching Macbeth's castle to besiege it. Macbeth, the play's protagonist, is confident that he can withstand any siege from Malcolm's forces. He hears the cry of a woman and reflects that there was a time when his hair would have stood on end if he had heard such a cry, but he is now so full of horrors and slaughterous thoughts that it can no longer startle him.
Seyton then tells Macbeth of Lady Macbeth's death, and Macbeth delivers this soliloquy as his response to the news. Shortly afterwards he is told of the apparent movement of Birnam Wood towards Dunsinane Castle (as the witches previously prophesied to him), which is actually Malcolm's forces having disguised themselves with tree branches so as to hide their numbers as they approach the castle. This sets the scene for the final events of the play and Macbeth's death at the hands of Macduff.