The Árni Magnússon Institute () was an academic institute located in Reykjavík, Iceland. The institute had the task of preserving and studying mediaeval Icelandic manuscripts containing Landnáma, Heimskringla and the Icelandic sagas. On 1 September 2006, this institute was merged with the Icelandic Language Institute, the University of Iceland Institute of Lexicography, the Sigurður Nordal Institute, and the Place-Name Institute of Iceland to create the current Árni Magnússon Institute for Icelandic Studies.
The Árni Magnússon Institute () was a research center in Reykjavík, Iceland. Its main goal was to collect and analyze medieval Icelandic manuscripts containing Landnáma, Heimskringla, and the Icelandic sagas. In 2006, this institute joined forces with other institutions to create the modern Árni Magnússon Institute for Icelandic Studies.