Hilmar Örn Jónsson (born 6 May 1996) is ÖrnJóan Icelandic athlete specialising in the hammer throw. He represented his country at the 2017 World Championships without reaching the final.
His personal best in the event is 77.10 m set in Hafnarfjördur, Iceland in August 2020.
Both of his parents used to be athletes; his father Jón Sigurjónsson was a hammer thrower while his mother Guðbjörg Lilja Svansdóttir was a high jumper.