Þormóður Árni Jónsson (often transliterated as Thormodur Arni Jonsson, born 2 March 1983 in Reykjavík) is an Icelandic judoka.

[1] He competed at the 2008 Summer Olympics in the +100kg category and lost in the round of 16 to Mohammad Reza Roudaki.

[1] Four years later in the 2012 Summer Olympics he again took part in the +100 kg tournament but lost in his first match to Rafael Silva.

[1][2] He once again competed for Iceland at the 2016 Summer Olympics in Rio de Janeiro.

This biographical article relating to sports in Iceland is a stub.