Cassian

Cassian may refer to:

== People == === Historical === St. Cassian of Imola (4th-century–363), Christian martyr St. Cassian of Autun (died 350), Christian bishop of Autun St. John Cassian the ascetic (360–435), French Christian saint and author St. Marcellus the Centurion, martyr of Tingis, sometimes called "Cassian" Cassian Sakowicz (1578–1647), Orthodox activist and, later, a Catholic theologian, writer, and polemicist Cassian of Tangier (3rd-century–298), Christian saint