Hilmar Örn Jónsson (born 6 May 1996) is an 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 72.38 m set in Eugene in 2017.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.