Hilmarsson is an Icelandic surname, and means 'son of Hilmar'. In Icelandic names, the name is not strictly a surname as it is not a family name, but a patronymic. The female variant is Hilmarsdóttir. Notable people with this name include:
Arnar Rósenkranz Hilmarsson, drummer in Of Monsters and Men Atli Hilmarsson (born 1959), Icelandic handball player and Olypmpian Daníel Hilmarsson (born 1964), Icelandic alpine skier Haukur Hilmarsson (1986–2018), Icelandic activist Hilmar Örn Hilmarsson (born 1958), musician, art director and allsherjargoði of Ásatrúarfélagið Jörundur Garðar Hilmarsson (1946–1992), Icelandic linguist, grammarian and expert in Tocharian and Indo-European languages Siggi Hilmarsson, founder of Siggi's Dairy
Tómas Þórður Hilmarsson (born 1995), Icelandic basketball player
See also Hilmar (disambiguation)