The 2024–25 UEFA Champions League was the 70th season of Europe's premier club football tournament organised by UEFA, and the 33rd season since it was rebranded from the European Champion Clubs' Cup to the UEFA Champions League. This was the first season under a new format, which had 36 participating teams that played eight games each against different opponents in a league phase, all the teams being ranked in a joint group. This increased the total number of matches played in the competition from 125 to 189 (excluding qualifying rounds).

Luis Enrique's Paris Saint-Germain defeated Simone Inzaghi's Inter Milan 5–0 in the final, which was held at the Allianz Arena in Munich, Germany, to win their first Champions League title in a record margin of victory. As winners of the Champions League, Paris Saint-Germain automatically qualified for the 2025–26 UEFA Champions League league phase, the 2025 FIFA Intercontinental Cup final, the 2029 FIFA Club World Cup group stage, and earned the right to play against Tottenham Hotspur, the winners of the 2024–25 UEFA Europa League, in the 2025 UEFA Super Cup. Paris Saint-Germain became the second French side to win after Olympique Marseille in the 1992–93 edition and the first team since Porto in the 2003-04 edition that didn't come from England, Germany, Italy or Spain.

Real Madrid were the defending champions, having won a record-extending 15th title in the previous season, but were eliminated by Arsenal in the quarter-finals.

A total of 81 teams from 53 of the 55 UEFA member associations participated in the 2024–25 UEFA Champions League (the exceptions being Liechtenstein, which did not organise a domestic league, and Russia, which was suspended). The association ranking based on the UEFA association coefficients was used to determine the number of participating teams for each association:

For the 2024–25 UEFA Champions League, the associations were allocated places according to their 2023 UEFA association coefficients, which took into account their performance in European competitions from 2018–19 to 2022–23. The table reflects Russia's ongoing suspension from UEFA.

Apart from the allocation based on the association coefficients, associations could have additional teams participating in the Champions League, as noted below:

The information here reflects the suspension of Russia in European football, and so the following changes to the default access list were made:

As the Champions League title holders (Real Madrid) qualified via their domestic league's standard berth allocation, the following changes to the default access list were made: