Paschasius is a masculine given name. It may refer to:

• Paschasius, villain in the legend of Saint Lucy (late 3rd century)
• Paschasius of Vienne (fl. 4th century), bishop of Vienne
• Paschasius (d. 437), advisor of the Vandal king and martyr alongside Arcadius and companions
• Paschasius of Rome (d. 512), Roman deacon and writer
• Paschasius (fl. 533), Roman praefectus annonae
• Paschasius of Dumium (fl. c. 555), Galician monk and translator
• Paschasius Radbertus (d. 865), Frankish monk and scholar
• Paschasius, Bishop of Nyitra (fl. 1280–1297), Hungarian prelate