Árni is an Icelandic given name. Notable people with the name include:
Árni Gautur Arason (born 1975), Icelandic football goalkeeper
Árni Már Árnason (born 1987), Icelandic Olympic swimmer
Árni Páll Árnason (born 1966), Icelandic politician, Minister for Social Affairs
Árni beiskur (died 1253), Icelandic killer
Árni Bergmann (born 1935), Icelandic novelist
Árni Frederiksberg (born 1992), Faroese football midfielder
Árni Helgason (c. 1260–1320), Icelandic Roman Catholic clergyman
Árni Johnsen (born 1944), Icelandic politician and criminal
Árni Lárentíusson (1304–after 1337), Icelandic prose writer
Árni Magnússon (1663–1730) was an Icelandic scholar and collector of manuscripts
Árni Magnússon (politician) (born 1965), Icelandic politician, Minister for Social Affairs
Árni Mathiesen (born 1958), Icelandic Minister of Finance
Árni Njálsson (born 1936), Icelandic football defender
Árni Sigfússon (born 1956), Icelandic policitican; former mayor of Reykjavík
Árni Þór Sigurðsson (born 1960), Icelandic ambassador
Árni Stefánsson (born 1953), Icelandic football goalkeeper
Árni Sveinsson (born 1956), Icelandic football midfielder
Arni Thorvaldsson (born 1984), Icelandic alpine skier
Árni Vilhjálmsson (born 1994), Icelandic football striker
Árni Þórarinsson (born 1950), Icelandic writer
Árni Þorláksson (1237–1298), Icelandic Roman Catholic clergyman
