| 1983–84 FIBA European Cup Winners' Cup | |
| League: | FIBA European Cup Winners' Cup |
| Sport: | Basketball |
| Finals: | Finals |
| Finals Link: | 1983–84 FIBA European Cup Winners' Cup Finals |
| Finals Champ: |  Real Madrid |
| Finals Runner-Up: |  Simac Milano |
| Seasonslistnames: | FIBA European Cup Winners' Cup |
| Prevseason Link: | 1982–83 FIBA European Cup Winners' Cup |
| Prevseason Year: | 1982–83 |
| Nextseason Year: | 1984–85 |
| Nextseason Link: | 1984–85 FIBA European Cup Winners' Cup |
The 1983–84 FIBA European Cup Winners' Cup was the eighteenth edition of FIBA's 2nd-tier level European-wide professional club basketball competition, contested between national domestic cup champions, running from 27 September 1983, to 14 March 1984. It was contested by 24 teams, five more than in the previous edition.[1]
Real Madrid defeated Simac Milano, in the final held in Ostend, winning its first FIBA European Cup Winners' Cup.
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Scavolini Pesaro (title holder) Real Madrid| Top two places in each group advance to semifinals |
Group A
| Group B
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March 14, Stedelijk Sportcentrum, Ostend|}