"All Prologue" is the sixth episode of the second season of the HBO original series, The Wire. The episode was written by David Simon from a story by David Simon & Ed Burns and was directed by Steve Shill. It originally aired on July 6, 2003.

The episode title refers to D'Angelo's comment that all of a person's life is an unchanging prologue to their current situation. It also underscores the divide between the first and second halves of the season, when consequences of actions come more sharply into focus.

D'Angelo makes this comment when discussing F. Scott Fitzgerald's novel The Great Gatsby and the theme of Gatsby's inability to escape his past and who he was no matter how much he tried to cover it, a sentiment that D'Angelo shares as he is unable to escape that he is a Barksdale. It also refers to Jimmy McNulty's attempts at reconciliation with his wife.

Although credited, John Doman, Frankie Faison, Deirdre Lovejoy and Andre Royo do not appear in this episode.

When Omar Little is called into court, he answers honestly about his occupation as ASA Ilene Nathan questions him. Omar is quick to identify Marquis "Bird" Hilton, stating that they served prison time together. Bird's attorney Maurice Levy objects to the reference to Bird's previous convictions and it is stricken from the record. Omar identifies Bird's weapon and provokes Bird, who becomes angry, and Judge Phelan calls for order. As they observe the trial, Stringer Bell discusses with Jimmy McNulty whether Bird was responsible for the murder in reality.

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