Saint Cassius may refer to:
Cassius of Clermont, martyr, 3rd century. Martyred with Victorinus, Maximus, Anatolius, Linguinus, and others Cassius of Narni, bishop of Narni, 6th century Saint Cassius, companion of Saint Gereon Saint Cassius, companion of Saint Castus Saint Cassius (musician) American musician See Carpophorus, Exanthus, Cassius, Severinus, Secundus, and Licinius for Saint Cassius