1970–71 FIBA European Cup Winner's Cup

The 1970–71 FIBA European Cup Winner's Cup was the fifth edition of FIBA's competition for European basketball national cup champions, running from 2 December 1970 to 7 April 1971. It was contested by 26 teams, six more than in the previous edition.

Italy became the first country to win the competition twice in a row as 1966 European Cup champion Simmenthal Milano defeated Spartak Leningrad in the last of the competition's three two-legged finals. It previously defeated defending champion Fides Napoli in the semifinals, in the competition's first tie between two clubs from the same country. Olimpia Milano was the third Italian club to win the Cup Winners' Cup after Ignis Varese and Fides Napoli.