Serenus may refer to: Saint Serenus the Gardener (Sirenatus, Cerneuf), also known as Serenus of Sirmium Saint Serenus of Alexandria (died 202 AD), Egyptian martyr Serenus Sammonicus, a Roman scholar Serenus of Antinoöpolis, also known as Serenus of Antinoeia, a mathematician from Antinoöpolis. Serenus, a messiah claimant (circa 720) Serenicus and Serenidus of Saulges