| Gian Corrado Gross | |
| Nicknames: | Gianni |
| Nationality: | Italian |
| Birth Date: | 1942 2, df=yes |
| Birth Place: | Berlin, Germany |
| Death Place: | Padua, Italy |
| Height: | 1.74 m |
| Weight: | 79 kg |
| Strokes: | Breaststroke |
| Club: | Rari Nantes Florentia, Firenze |
| Show-Medals: | yes |
Gian Corrado "Gianni" Gross (11 February 1942 - 30 June 2016)[1] was a breaststroke swimmer from Italy.
He competed at the 1964 Summer Olympics in the 200 m breaststroke and 4 × 100 m medley relay and reached the final in the relay.[2] He won a gold medal in the 100 m at the 1967 Mediterranean Games.