Jón Jónsson Aðils (25 April 1869, Reykjavík - 5 July 1920) was an Icelandic historian.
He's been described as "Iceland's most prolific historian of the early twentieth century." Historians and political scientists argue that Aðils strongly shaped Icelandic nationalist discourse, and that his influence still affects Icelandic discourse on sovereignty issues, such as European integration.