The 2023–24 EHF Champions League knockout stage began on 27 March with the playoffs and ended on 9 June 2024 with the final at the Lanxess Arena in Cologne, Germany, to decide the winners of the 2023–24 EHF Champions League.
In the playoffs, the eight teams ranked 3rd–6th in Groups A and B played against each other in two-legged home-and-away matches.
The four quarterfinal winners qualified for the final four tournament at the Lanxess Arena in Cologne, Germany.
[1] The top six teams from Groups A and B qualified for the knockout stage.
The final four was held at the Lanxess Arena in Cologne, Germany on 8 and 9 June 2024.