István Jónyer (born 4 August 1950 in Miskolc) is a former international table tennis player from Hungary.

He was one of the most dominant players of the sport in the 1970s and famous for inventing the sidespin loop shot.

From 1968 to 1983 he won several medals in singles, doubles, and team events in the World Table Tennis Championships and in the Table Tennis European Championships.

[4][5] On the professional circuit, Jonyer won 4 singles and 11 doubles titles in his career, including English Open title in doubles event.

This biographical article relating to a Hungarian table tennis figure is a stub.