The 1964 Water Polo European Cup was the inaugural edition of LEN's premier competition for men's water polo clubs.
The competition consisted of two round-robin stages, and it was contested by fifteen national champions.
[1] The final stage, held in March, was originally planned to be contested by the two top teams from each group, but LEN later expanded it to six teams.
[2] Partizan won all five games to win the championship, while Dynamo Moscow was the runner-up.
This article about an international water polo competition is a stub.