The 1993–94 UEFA Champions League knockout stage began on 27 April with the semi-finals and ended on 18 May 1994 with the final at the Olympic Stadium in Athens, Greece, to decide the champions of the 1993–94 UEFA Champions League. A total of four teams competed in the knockout stage.
Each tie in the knockout stage was played in a single match. For the semi-finals, the group winners played at home against the runner-up of the other group. If the score was level at the end of normal time, extra time would be played, followed by a penalty shoot-out if the score was still level.
^"Milan vs. Monaco"(JSON). Union of European Football Associations. Retrieved 20 September 2021.
^"Barcelona vs. Porto"(JSON). Union of European Football Associations. Retrieved 20 September 2021.
^"2. Finals"(PDF). UEFA Champions League Statistics Handbook 2016/17. Nyon: Union of European Football Associations. 2017. p. 1. Retrieved 22 April 2017.
Note: In 1991–92, the competition was still known as the European Cup, but is included as it was the first to use a group stage format. In that season and 1992–93, there was no knockout phase between the group stage and final.