The UEFA Cup Winners' Cup (also known as the European Cup Winners' Cup) was a _football club competition contested annually by the most recent winners of all European domestic cup competitions. The cup is one of the many inter-European club competitions that have been organised by UEFA. The first competition was held in the 1960/61 season, and the last in 1998/99. The competition was then abolished to make way for a further expansion to the UEFA Champions League, with domestic cup winners now gaining entry into the UEFA Cup.

Prior to its abolition, the Cup Winners' Cup was regarded as the second most prestigious European club competition out of the three major tournaments, behind the UEFA Champions League/European Cup and ahead of the UEFA Cup, although many commentators felt the Cup Winners' Cup was the easiest of the three competitions to win.

From 1972 onwards, the winner of the tournament would go on to play the winner of the European Cup (later the UEFA Champions League) in the UEFA Super Cup. Since the abolition of the Cup Winners' Cup, the Super Cup place previously reserved for the CWC winner has been taken by the winner of the UEFA Cup.

From its inception until 1994, the competition was known as the 'European Cup Winners' Cup' - from the 1994/95 season onwards, UEFA officially named the tournament the 'UEFA Cup Winners' Cup'. The competition is also sometimes referred to as European Cup 2, EC2 or simply C2, usually in football statistics books and websites, although this shorthand was also used on some match tickets and in programmes. Despite the abolition of the Cup Winners' Cup, the modern UEFA Cup is still referred to in shorthand as EC3, in order to avoid confusion with the CWC.