Heidar Shonjani or Haydar Shonjani (, 16 December 1945 â 8 November 2020), was an Iranian swimmer and water polo player.
His first international tournament was the 1964 Summer Olympics, where he became the first Iranian swimmer to participate in the Summer Olympics; he swam 100 m freestyle, but failed to reach the final. Shonjani was a member of Iran national water polo teams that won a gold medal at the 1974 Asian Games and competed in the 1976 Summer Olympics, finishing 12th.