| István Gergely | |
| Nationality: | Hungarian, Slovakia |
| Birth Date: | 20 August 1976 |
| Birth Place: | Dunajská Streda, Czechoslovakia[1] |
| Position: | Goalkeeper |
| L/R: | Right |
| Currentclub: | Bp. Honvéd (president) |
| Youthclubs1: | KVP Komárno |
| Years1: | –1994 |
| Clubs1: | KVP Komárno |
| Years2: | 1994–1997 |
| Clubs2: | Slávia UK Bratislava |
| Years3: | 1997–1999 |
| Clubs3: | NCHZ Nováky |
| Years4: | 1999–2000 |
| Clubs4: | Cagliari |
| Years5: | 2000–2002 |
| Clubs5: | CN Terrassa |
| Years6: | 2002–2014 |
| Clubs6: | RacioNet Honvéd |
| Nationalyears1: | 1993–2002 |
| Nationalcaps1: | 130 |
| Nationalyears2: | 2002–2011 |
| Coachyears1: | 2013–2016 |
| Coachclubs1: | Hungary (goalkeeping) |
| Coachyears2: | 2017– |
| Coachclubs2: | Bp. Honvéd (president) |
István Gergely (hu|link=no|Gergely István; born 20 August 1976 in Dunajská Streda, Czechoslovakia) is a Slovak–Hungarian water polo player. He was a member of the gold medal-winning Hungary national team at the 2004 and 2008 Olympics. He also represented Slovakia national team at the 2000 Olympics.[2]