Juventus reached their ninth final after a 4–1 aggregate win against Monaco to maintain their undefeated record in this season's competition.

Four times prior the previous champions had advanced to the final (Milan in 1995, Ajax in 1996, Juventus in 1997, and Manchester United in 2009), but on all occasions the title holders lost.

The most recent meeting between the clubs had taken place in the 2014–15 UEFA Champions League semi-finals, where Juventus won 3–2 on aggregate to advance to the 2015 final.

The Millennium Stadium was announced as the final venue on 30 June 2015, following the decision of the UEFA Executive Committee meeting in Prague, Czech Republic.

The remaining tickets were allocated to the local organising committee, UEFA and national associations, commercial partners and broadcasters, and to serve the corporate hospitality programme.

[2] American hip-hop group The Black Eyed Peas performed at the opening ceremony, which included a pyrotechnic display that ran over time and delayed the kick-off for several minutes.

[23] The UEFA Champions League Anthem featured a recording of Italian tenor Andrea Bocelli from the previous season's final.

[24] The 2017 UEFA Women's Champions League final was held two days prior, on 1 June 2017, at the Cardiff City Stadium, with title holders Lyon beating Paris Saint-Germain 7–6 on penalties, following a 0–0 draw after extra time.

The winning penalty was scored by Lyon goalkeeper Sarah Bouhaddi, immediately after her opposite number, Katarzyna Kiedrzynek, had missed her kick.

Despite the scoring chances, as well as the closing down of Real Madrid's counterattacks in the midfield, Cristiano Ronaldo scored the first goal of the match in the 20th minute; Dani Carvajal played a one-two on the right with Ronaldo before passing across for him to shoot low to the left corner of the net, which deflected in off the right foot of Leonardo Bonucci.

[29] Juventus remained in control through the end of the first half, while Real Madrid conceded two yellow cards for defenders Sergio Ramos and Dani Carvajal.

[26][27] Real Madrid began the second half strongly and in control,[27] though play was stopped several times for fouls and injuries to both sides.

[30] Real Madrid took a 2–1 lead in the 61st minute from a long-range strike from Casemiro, which deflected off Sami Khedira and past Gianluigi Buffon to the left corner of the net.

[26][30] Three minutes later, Ronaldo scored Madrid's third goal of the night and his second, finishing in the 6-yard (5.5 m) box from a cut-back from Luka Modrić on the right.

[30] Real Madrid replaced striker Karim Benzema with Gareth Bale, a Cardiff native who had not been fit enough to start but was given a homecoming.

[30] Marco Asensio scored Madrid's fourth and final goal in the 90th minute, a tap-in from 12 yards (11 m) after a cut-back from Marcelo from the left.

UEFA president Aleksander Čeferin said "The pitch is the players' stage and it is only fitting that their achievements are celebrated there", The European Cup was then presented to Real Madrid captain Sergio Ramos to commemorate the first team to win it the back-to-back.

Allegri added, "Even if Real Madrid had a very good second half and have excellent players who can change the game at any moment, that second goal knocked the wind out of our sails.

At that moment, we should've taken out the extra energy to push hard and keep the game open, as we know Real Madrid leave you the chances to score at all times, but we conceded the third goal and that was really damaging.

If Juventus had won, Buffon would have become the oldest player to win a Champions League surpassing compatriot Paolo Maldini.

FIFA President Gianni Infantino, who attended the match, told reporters, "Juventus played a great first half, then in the second Real Madrid were extraordinary.

Kroos also pointed out that Juventus had only conceded three goals in their entire Champions League campaign, and that scoring four against them in the final was a sign of Madrid's quality.