Gelasius is a masculine given name, from Greek Γελάσιος (Gelásios), from Ancient Greek γέλασις (gélasis, “laughing”). It may refer to:
- Pope Gelasius I (died 496)
- Pope Gelasius II (died 1119)
- Gelasius of Cyzicus (fifth century), ecclesiastical writer
- Gelasius of Caesarea (died 395), bishop of Caesarea
- Gelasius of Nilopolis (fifth century), Egyptian Christian abbot
- Gelasius, Archbishop of Armagh (1137 to 1174)
- Gelasius O'Cullenan, Cistercian Abbot of Boyle, Ireland
This disambiguation page lists articles about people with the same name.
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