Bjarnason is a surname of Icelandic origin, meaning son of Bjarni. In Icelandic names, the name is not strictly a surname, but a patronymic. The name may refer to:
Ágúst H. Bjarnason (1875–1952), Icelandic psychologist, professor, and author
Birkir Bjarnason (b. 1988), Icelandic professional football player
Bjarni Bjarnason (b. 1965), Icelandic author and poet
Björn Bjarnason (b. 1944), Icelandic politician, Minister of Justice and Ecclesiastical Affairs since 2003
Brynjólfur Bjarnason (b. 1898, d. unknown), Icelandic communist politician
Ólafur Örn Bjarnason (b. 1975), Icelandic professional football player
Teddy Bjarnason (b. 1987), Icelandic professional football player
Eric Bjarnason (b. 1964), Computer Scientist and Bon Vivant
