Jon Istad (29 July 1937 – 17 May 2012) was a Norwegian biathlete and sport shooter.

[1] He competed at the 1960, 1964 and 1968 Winter Olympics, and all three times finished eleventh in the 20 kilometres.

In 1968 he also won a silver medal with the Norwegian relay team.

[1] At the World Championships he won a gold medal in the 20 km event in 1966 in Garmisch-Partenkirchen, becoming the second biathlon world champion in Norway's history.

[2] Istad was also a national champion, European Championships bronze medalist and World Championships silver medalist (in the team competition) in sport shooting.