| István Szívós | |
| Full Name: | István Antal Szívós |
| Birth Date: | 24 April 1948 |
| Birth Place: | Budapest, Hungary |
| Death Place: | Budapest, Hungary |
| Height: | 202 cm |
| Weight: | 106 kg |
| Sport: | Water polo |
| Club: | Ferencvárosi TC OSC |
| Show-Medals: | yes |
István Antal Szívós, also known as István Szívós Jr. (Hungarian: ifj. Szívós István, 24 April 1948 – 10 November 2019) was a Hungarian water polo player. He competed in four consecutive Olympics in 1968–1980 and won a medal in each of them, becoming one of eight male athletes who won four or more Olympic medals in water polo.[1] He also won six gold or silver medals at world and European championships and nine national titles. Between 1966 and 1980 he played 308 international matches for Hungary. In 1996 he was inducted to the International Swimming Hall of Fame, one year earlier than his father István Sr., who won Olympic gold medals in water polo in 1952 and 1956.
Szívós graduated from the Medical University in Budapest, where he later worked as a dentist. After retiring from competitions in 1980 he also became a water polo coach and president of Ferencvárosi TC, and served as a board member of the Hungarian Water Polo Federation.
His son Márton is also world champion and his father István was also Olympic champion in water polo. He died 10 November 2019 at the age of 71.[2]