Sultan Cem or Cem Sultan (December 22, 1459–February 25, 1495), also referred to as Jem Sultan, or Jem Zizim by the French, is a pretender to the Ottoman throne in the 15th century.

He is a son of Sultan Mehmed II of the Ottoman Empire.

Cem is the younger half-brother of Sultan Bayezid II of the Ottoman Empire and thus a half-uncle of Sultan Selim I of Ottoman Empire.

He is banished to Europe, first under the protection of the Knights Hospitaller of St. John on the island of Rhodes and ultimately that of the Pope.