Saint Alexander may refer to one of several saints including:
Pope Alexander I (died 115), bishop of Rome from and hieromartyr Alexander (101–165), one of the seven sons of Felicitas of Rome Epipodius and Alexander (died 178), martyrs in Lyon Alexander of Jerusalem (died 251), bishop of Jerusalem and hieromartyr Alexander of Comana (died ), bishop of Comana Alexander of Rome (died ), martyr Alexander (died 290), a martyr and companion of Saint Victor of Marseilles Alexander of Bergamo (died ), martyr and patron saint of Bergamo Alexander (died 320), one of the Forty Martyrs of Sebaste Pope Alexander I of Alexandria (died 326 or 328), Patriarch of Alexandria Alexander of Constantinople (–337), bishop of Byzantium and first bishop of Constantinople Sisinnius, Martyrius and Alexander (died 405), martyrs
Eastern Orthodox
Alexander Nevsky (1220–1263), Grand Prince of Novgorod and Vladimir Alexander Svirsky (1448–1533), Russian hegumen Alexander Hotovitzky (1872–1937), Russian hieromartyr Alexander of Munich (1917–1943), or Alexander Schmorell, Russian member of the White Rose resistance group and neomartyr
Roman Catholic
Alexander Sauli (1535–1592), the "Apostle of Corsica", member of an illustrious Lombard family