"Mission Accomplished" is the 12th and final episode of the third 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 Ernest Dickerson. It originally aired on December 19, 2004.

The title refers to McNulty completing his goal of breaking the Barksdale organization, and Omar and Brother Mouzone completing their mission of killing Stringer. It also refers to the success of Cutty's attempts at personal reform by starting a new life as a boxing trainer.

The title is also a reference to President George W. Bush announcing the supposed end of the War in Iraq. In the audio commentary for this episode, David Simon confirmed that the season had been a symbolization of that war.

Slim Charles uses this phrase to convince Avon Barksdale of the need to see their war with Marlo Stanfield through to the finish now that it is underway, even though the pretense for retaliation (the death of Stringer Bell at the hands of the Stanfield organization) is false. It is also a reference to the war in Iraq, fought on the lie of Saddam Hussein having weapons of mass destruction.

Solomon Burke's cover of Van Morrison's "Fast Train" plays over the episode's closing montage. David Simon credits co-executive producer Joe Chappelle with choosing the song.

Tommy Carcetti discusses Major Howard "Bunny" Colvin's Hamsterdam project with his campaign manager Theresa D'Agostino. Colvin had set up free zones away from residential areas where the drug trade was allowed to continue unchallenged. Carcetti wonders if Colvin's initiative is a step in the right direction. D'Agostino wants Carcetti to consider how his knowledge can help them win in the upcoming mayoral race. Carcetti believes that Royce is holding off on shutting down the Hamsterdam zones so that he can first concoct a story claiming that it was part of an enforcement strategy.

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