The sixth Inter-Cities Fairs Cup was played over the 1963–64 season.

The competition was won by Zaragoza in a one-off final at Camp Nou in Barcelona against fellow Spaniards and defending champions Valencia.

There was only one representative city team, from Copenhagen, with established sides filling all the other slots.

1 Lausanne-Sport won 3–2 after extra time in a play-off to advance to the second round.

3 RFC Liegeois won 1–0 in a play-off in Liège to advance to the semi-finals.