Real Madrid defeated Borussia Dortmund 2–0 in the final, which was played at the Wembley Stadium in London, England,[3] for a record-extending 15th European Cup title, and their sixth in eleven years.

[5] Manchester City were the defending champions, but were eliminated by eventual winners Real Madrid in the quarter-finals.

A total of 78 teams from 53 of the 55 UEFA member associations participated in the 2023–24 UEFA Champions League (the exceptions being Liechtenstein,[Note LIE] which did not organise a domestic league, and Russia[Note RUS]).

[7] The team allocation reflected Russia's ongoing suspension from UEFA competitions.

[8] Due to the suspension of Russia for the 2023–24 European season, the following changes to the access list were made: Since the Champions League title holders (Manchester City) qualified via their domestic league, the following changes to the access list were made: The labels in the parentheses show how each team qualified for the place of its starting round: The second qualifying round, third qualifying round and play-off round were divided into Champions Path (CH) and League Path (LP).

The losers of the semi-finals and final transferred to the Europa Conference League second qualifying round Champions Path.

13 of the 15 losers were transferred to the Europa Conference League Champions Path second qualifying round and 2 losers received a bye and were transferred to the Europa Conference League Champions Path third qualifying round.

The group stage draw for the 2023–24 UEFA Champions League took place at the Grimaldi Forum, Monaco, on 31 August at 18:00 CEST.

Union Berlin and Antwerp made their debut appearances in the group stage.

In the knockout phase, teams played against each other over two legs on a home-and-away basis, except for the one-match final.