2017–18 Basketball Champions League Playoffs
The 2017–18 Basketball Champions League Playoffs began on 6 March, and ended on 6 May, with the Final, to decide the champions of the 2017–18 season of the Basketball Champions League. 16 teams competed in the play-offs.
Format
The playoffs involved the sixteen teams which qualified between the four first teams of each of the four groups in the 2017–18 Basketball Champions League Regular season.The group winners will face the fourth qualified teams and the runners-up will play against the third qualified teams. Winners and runners-up will play the second leg at home. In addition, the winners of the matches involving the group winners will play also the second leg of the quarterfinals at home.
Each tie in the Playoffs, apart from the Final Four games, was played with two legs, with each team playing one leg at home. The team that scored more points on aggregate, over the two legs, advanced to the next round.
For the round of 16, teams from the same group could not be drawn against each other.
Qualified teams
| Group | Winners | Runners-up | Third | Fourth |
| A |  Monaco |  Pınar Karşıyaka |  EWE Baskets Oldenburg |  UCAM Murcia |
| B | Iberostar Tenerife | MHP Riesen Ludwigsburg |  PAOK |  Neptūnas |
| C | SIG Strasbourg | Banvit | AEK Athens | Medi Bayreuth |
| D | Beşiktaş Sompo Japan |  ČEZ Nymburk | Nanterre 92 |  Stelmet Enea Zielona Góra |