The player with the most appearances in the UEFA Champions League semi-finals is Cristiano Ronaldo, who has played in the semi-finals a total of 14 times as of the end of the 2020-21 season. Ronaldo has reached the semi-finals with both Manchester United and Real Madrid, winning the competition a total of five times. Lionel Messi is the second player with the most appearances in the semi-finals, having played in the semi-finals 11 times, all with Barcelona.
UEFA Champions League
21 Cristiano Ronaldo (Manchester United, Real Madrid)
17 Xabi Alonso (Liverpool, Real Madrid, Bayern München)
16 Xavi Hernández (Barcelona)
16 Sergio Ramos (Real Madrid)
16 Karim Benzema (Real Madrid)
16 Toni Kroos (Bayern München, Real Madrid)
15 Lionel Messi (Barcelona)
15 Thomas Müller (Bayern München)
14 Dani Alves (Barcelona, Juventus)
14 Iker Casillas (Real Madrid)
