The 2019–20 UEFA Champions League was the 65th season of Europe's premier club football tournament organised by UEFA, and the 28th season since it was renamed from the European Champion Clubs' Cup to the UEFA Champions League.
Bayern Munich defeated Paris Saint-Germain in the final, played at the Estádio da Luz in Lisbon, Portugal, 1–0 and became the first European Cup winners to win all their matches during the tournament. In addition, the Germans secured their second continental treble, becoming only the second European club to do so, and became the first team to claim any European competition with a 100% winning record. As winners, they earned the right to play against Sevilla, the winners of the 2019–20 UEFA Europa League, in the 2020 UEFA Super Cup, and also qualified for the 2020 FIFA Club World Cup in Qatar. They would go on to win both competitions. Since they had already qualified for the 2020–21 UEFA Champions League group stage through their league performance, the berth originally reserved for the Champions League title holders was given to the team that was top of the 2019–20 Eredivisie (Ajax) , the 11th-ranked association according to next season's access list, when it was suspended due to the COVID-19 pandemic.
Due to the impact of the COVID-19 pandemic, the tournament was suspended in mid-March 2020 and resumed in August. The quarter-finals onwards were played as single-match knockout ties at neutral venues in Lisbon, Portugal (Estádio da Luz and Estádio José Alvalade) behind closed doors from 12 to 23 August. In keeping with its introduction the campaign prior, the video assistant referee (VAR) system was in use from the play-off round onwards.
Liverpool were the defending champions, but they – along with the previous season's other finalists, Tottenham Hotspur – were eliminated in the round of 16, following defeats to Atlético Madrid and RB Leipzig respectively.