Saint Ursicinus (also Hursannus, Ursitz, Oschanne, fl. 600) was an Irish missionary and hermit in the Jura region.
A vita of his is preserved in a redaction of the 11th century. According to this account, he was a disciple of Saint Columbanus at Luxeuil who followed his master when he was banished from Burgundy in 610, but then retired as a hermit in the Doubs valley. Verenration of Ursicinus is attested since the 7th century. In Grandval, a church was dedicated to Ursicinus in 675. By the 11th century, he was part of the local canon of saints of the Besançon diocese. His feast day was on 20 December. The supposed sarcophagus of Ursicinus is preserved in St-Ursanne in what is now the canton of Jura in Switzerland. In iconography, Ursicinus is depicted as holding a book and lilies in his hands.
- Andreas Merkt, Ursicinus in Biographisch-Bibliographisches Kirchenlexikon, vol. 12 (1997).