Pietro Pennisi (born 11 April 1970) is an Italian former professional tennis player. He is now a lawyer.
Born in Florence, Pennisi is the son of Alessandra Gobbò, a tennis player of the 1960s who won a Universiade gold medal for Italy. His brother Lorenzo was also a tennis player.
Pennisi, a left-handed player, was a doubles runner-up at the ATP Florence. His best performance in singles was a second round appearance at the Bologna Outdoor in 1995.
| Loss | 0–1 | May 1989 | ATP Florence, Italy | Clay | Simone Restelli | Mike De Palmer Blaine Willenborg |
| 1. | 1994 | Bristol, England | Grass | Alex Rădulescu | Massimo Bertolini Dick Norman | 6–4, 7–5 |
| 2. | 1995 | Goa, India | Clay | Davide Sanguinetti | Ivan Baron João Cunha e Silva | 7–6, 6–4 |
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