The knockout stage of the EuroBasket 2015 took place between 12 September and 20 September 2015. All games were played at Stade Pierre-Mauroy in Lille, France.
The top four teams of each preliminary group advanced.
While the Eurobasket champion and the runner-up automatically qualify for the 2016 Summer Olympics, the two losers of the semifinals advanced to the Olympic qualification tournament. The four losers of the quarterfinals played two extra playoff rounds in order to determine the three remaining OQT participants: 5–8 semifinals (the winners advancing to the OQT) and a 7–8 final (the winner advanced to the OQT and the loser was eliminated).
The winners of the 5–8th place semifinals advanced to the qualification tournament. The 5–8th place semifinals losers played in the seventh place game to determine the last participant.