Marianus

Marianus is a male name, formerly an ancient Roman family name, derived from Marius. Marianus may refer to:


 * Marianus of Auxerre (died 462 or 473), French monk and saint
 * Marianus Scotus of Mainz (1028–1082 or 83), otherwise Máel Brigte (Devotee of St. Brigid), Irish monk and chronicler
 * Marianus Scotus of Regensburg (died circa 1088), Irish monk, abbot of St. Peter's at Regensburg
 * Marianus II of Cagliari (died 1130), also known as Torchitorio II, Judge of Cagliari from c. 1102 to his death
 * Marianus of Florence (died 1523), Friar Minor, historian, and chronicler of the Franciscan Order
 * Marianus Brockie (1687–1755), Benedictine monk


 * Marianus of Arborea:
 * Marianus I of Arborea (died 1070), the Judge of Arborea from 1060 to his death
 * Marianus II of Arborea (died 1297), the Judge of Arborea from 1241 to his death
 * Marianus III of Arborea (died 1321), the sole Judge of Arborea from 1308 to his death
 * Marianus IV of Arborea (1329–1376), the Judge of Arborea from 1347 to his death
 * Marianus V of Arborea (1378–1407), the Judge of Arborea from 1387 until his death


 * Marianus of Torres:
 * Marianus I of Torres (died 1082?), the Judge of Logudoro from 1073 until c. 1082
 * Marianus II of Torres (died 1233), the Judge of Logudoro from 1218 until his death