Hartvik (Arduin) was a prelate (most probably the bishop of Győr) in the Kingdom of Hungary under King Coloman the Book-lover. He wrote a new Life of St Stephen I of Hungary based on the holy king's two earlier hagiographies.
- Gerics, József (1993). "Hartvik". In Kristó, Gyula; Engel, Pál; Makk, Ferenc. Korai magyar történeti lexikon (9-14. század) [=Encyclopedia of the Early Hungarian History (9-14th centuries)]. Akadémiai Kiadó. p. 255. ISBN 963-05-6722-9.