Saint Marcellinus may refer to:
Pope Marcellinus (died 304), bishop of Rome 296–304 and martyr Marcellinus and Peter (died 304), d. 304 Marcellinus of Carthage (died 413), secretary of state to Honorius and martyr Marcellinus of Gaul, feast day April 20 See Narcissus, Argeus, and Marcellinus for Marcellinus (died 320), soldier and martyr, d. 340 St. Marcellinus Secondary School, Mississauga, Ontario
See also Marcellinus (disambiguation)