The 1973–74 season of the European Cup football club tournament was won for the first time by Bayern Munich, beginning their own three-year period of domination, in a replayed final against Atlético Madrid, the only such occasion in the tournament's final.

This was the first time the cup went to Germany, and the only European Cup final to require a replay after the first match was drawn 1–1 after extra time.

Ajax, the three-time defending champions, were eliminated by CSKA September Flag in the second round.

4–4 on aggregate; Bayern Munich won on penalties.

CSKA September Flag won 4–0 on aggregate.

CSKA September Flag won 2–1 on aggregate.