Jón Hnefill Aðalsteinsson (born 1927) is an Icelandic scholar and folklorist. He is a prolific author and is well known for his works on Old Norse religion.

In his 2000 book on Hrafnkels saga, he emphasises its heathen religious elements. While acknowledging that a large part of the story line probably represents 13th-century fiction, Jón Hnefill finds evidence of an oral tradition in such aspects of the story as Hrafnkel's sacrifices and the behaviour of Freyfaxi.

Works

• Jón Hnefill Aðalsteinsson (2000). Þá hneggjaði Freyfaxi. Reykjavík: Háskólaútgáfan. ISBN 9979-54-431-7.

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