Stefano Mezzadri (born 26 May 1967) is a Swiss former professional tennis player.
Mezzadri appeared in his only Grand Prix circuit singles main draw at Geneva in 1987, with the tournament won by his older brother Claudio Mezzadri, a Davis Cup representative for Switzerland. As a doubles player he was a semi-finalist at Geneva in 1990 and won one ATP Challenger title. He played in qualifiers at the 1987 Wimbledon Championships.
| 1. | 1988 | Geneva, Switzerland | Clay | Nevio Devide | Mihnea-Ion Năstase Srinivasan Vasudevan | 7–6, 4–6, 6–4 |
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