| Birth Date: | 19 July 1949 |
| Birth Place: | Szeged, Hungary |
| Height: | 1.86m (06.1feet) |
| Weight: | 80kg (180lb) |
| Sport: | Swimming |
| Club: | BVSC, Budapest |
István Szentirmay (born 19 July 1949) is a retired Hungarian swimmer who won a bronze medal in the 4 × 100 m medley relay at the 1966 European Aquatics Championships. He competed in seven events at the 1968 and 1972 Summer Olympics; his best achievement was eighth place in the 4 × 100 m medley relay in 1972.