Jon Svaleson Smør (c. 1420–1483) was a Norwegian knight, riksråd and regent.

Jon was a son of the knight Svale Jonson Smør and his wife Sigrid Gunnarsdotter Kane.

Later, he was one of main forces behind the reactivation of the Norwegian Riksråd at the end of the reign of King Christian I.

Jon was probably after 1450 married to Gudrun Olavsdotter (c. 1415–1476/86), daughter of the knight Olav Håkonsson and Ingebjørg Jonsdotter.

Jon died of drowning at Jersøy, near Tønsberg, the last man in the direct male line of the Smør family.