Jan Valentin Sæther (18 March 1944 – 11 January 2018) was a Norwegian figurative painter, sculptor and gnostic priest.
Sæther received his education from the Norwegian National Academy of Craft and Art Industry (1963–65) and the Norwegian National Academy of Fine Arts, painting under the direction of professor Reidar Aulie (1965–66) and sculpture under professor Per Palle Storm (1968–71).
Between 1995 and 1996 he worked as amanuensis in charge of the models institute at the Oslo National Academy of the Arts.
In 1996 he was contracted as professor of figurative painting there following a contentious and much publicized hiring process where the only competition that was to be considered qualified was his youth friend Odd Nerdrum.
Sæther became an ordained reverend of the gnostic church in December 1988 by the regional bishop Stephan A. Hoeller of Ecclesia Gnostica in California.