Árnason (also Anglicised as Arnason) is a surname of Icelandic origin, meaning son of Árni. In proper Icelandic names, it would be written with the accent acute over the initial Á. In Icelandic names, it is not strictly a surname, but a patronymic. The name refers to:
Árni Árnason (disambiguation), multiple people, including:Árni Már Árnason (born 1987), Icelandic swimmerÁrni Páll Árnason (born 1966), Icelandic politicianBarbara Árnason (1911–1975), English-born Icelandic artistChuck Arnason (born 1951), Canadian professional ice hockey playerDavid Arnason (born 1940), Canadian author and poetEleanor Arnason (born 1942), American author of science-fiction novels and short storiesGarðar Árnason (born 1938), Icelandic footballerH. Harvard Arnason (1909–1986), American academic, administrator, author and art historianHjalti Árnason (born 1963), Icelandic strongman competitor and powerlifterHörður Árnason (born 1989), Icelandic football left backJón Árnason (disambiguation), multiple people, including:Jón Árnason (author) (1819–1888), Icelandic authorJón Loftur Árnason (born 1960), Icelandic chess grandmasterJón Gunnar Árnason (1931–1989), Icelandic sculptorKálfr Árnason (c.990–1051), Norwegian chieftainKári Árnason (disambiguation), multiple people, including:Kári Árnason (footballer, born 1944), Icelandic professional football playerKári Árnason (footballer, born 1982), Icelandic professional football playerMörður Árnason (born 1953), Icelandic politicianÖrn Árnason (born 1959), Icelandic actor, comedian and screenwriterTómas Árnason (born 1923), Icelandic politicianTyler Arnason (born 1979), American professional ice hockey playerVilhjálmur Árnason (born 1953), Icelandic professor of philosophy, researcher in genetics, and authorÞórólfur Árnason, Icelandic politician; mayor of Reykjavík 2003–04