2023–24 UEFA Champions League knockout phase

The 2023–24 UEFA Champions League knockout phase began on 13 February with the round of 16 and ended on 1 June 2024 with the final at Wembley Stadium in London, England, to decide the champions of the 2023–24 UEFA Champions League. A total of 16 teams competed in the knockout phase.

Times are CET/CEST, as listed by UEFA (local times, if different, are in parentheses).

Qualified teams
The knockout phase involved the 16 teams which qualified as winners and runners-up of each of the eight groups in the group stage. 

Format
Each tie in the knockout phase, apart from the final, was played over two legs, with each team playing one leg at home. The team that scored more goals on aggregate over the two legs advanced to the next round. If the aggregate score was level, then 30 minutes of extra time was played (the away goals rule was not applied). If the score was still level at the end of extra time, the winners were decided by a penalty shoot-out. In the final, which was played as a single match, if the score was level at the end of normal time, extra time was played, followed by a penalty shoot-out if the score was still level.  The mechanism of the draws for each round was as follows:
 * In the draw for the round of 16, the eight group winners were seeded, and the eight group runners-up were unseeded. The seeded teams were drawn against the unseeded teams, with the seeded teams hosting the second leg. Teams from the same group or the same association could not be drawn against each other.
 * In the draws for the quarter-finals and semi-finals, there were no seedings, and teams from the same group or the same association could be drawn against each other. As the draws for the quarter-finals and semi-finals were held together before the quarter-finals were played, the identity of the quarter-final winners was not known at the time of the semi-final draw. A draw was also held to determine which semi-final winner was designated as the "home" team for the final (for administrative purposes as it was played at a neutral venue).

For the quarter-finals and semi-finals, teams from the same city, were not scheduled to play at home on the same day or consecutive days, due to logistics and crowd control. To avoid such scheduling conflict, if the two teams were drawn to play at home for the same leg, the order of legs of the tie involving the team which was not titleholders of Champions League or Europa League (or lower-tier, if both were continental titleholders), or the team with the lower domestic ranking in the qualifying season (if neither team were continental title holder) was reversed from the original draw.

Schedule
The schedule was as follows (all draws were held at the UEFA headquarters in Nyon, Switzerland).

Bracket


Round of 16
 The draw for the round of 16 was held on 18 December 2023, 12:00 CET. 

Summary
 The first legs were played on 13, 14, 20 and 21 February, and the second legs were played on 5, 6, 12 and 13 March 2024.


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Matches
''1–1 on aggregate. Arsenal won 4–2 on penalties.''

Barcelona won 4–2 on aggregate.

Paris Saint-Germain won 4–1 on aggregate.

''2–2 on aggregate. Atlético Madrid won 3–2 on penalties.''

Borussia Dortmund won 3–1 on aggregate.

Bayern Munich won 3–1 on aggregate.

Manchester City won 6–2 on aggregate.

Real Madrid won 2–1 on aggregate.

Quarter-finals
 The draw for the quarter-finals was held on 15 March 2024, 12:00 CET. 

Summary
 The first legs were played on 9 and 10 April, and the second legs were played on 16 and 17 April 2024.


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Matches
Bayern Munich won 3–2 on aggregate.

Borussia Dortmund won 5–4 on aggregate.

''4–4 on aggregate. Real Madrid won 4–3 on penalties.''

Paris Saint-Germain won 6–4 on aggregate.

Semi-finals
 The draw for the semi-finals was held on 15 March 2024, 12:00 CET, after the quarter-final draw. 

Summary
 The first legs were played on 30 April and 1 May, and the second legs were played on 7 and 8 May 2024.


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Matches
Borussia Dortmund won 2–0 on aggregate.

Real Madrid won 4–3 on aggregate.

Final
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The final was played on 1 June 2024 at Wembley Stadium in London. A draw was held on 15 March 2024, after the quarter-final and semi-final draws, to determine the "home" team for administrative purposes. <section end=F />