The Demak Sultanate is a Javanese Muslim state located on Java's north coast in Indonesia, at the site of the present day city of Demak.

A port fief to the Majapahit kingdom thought to have been founded in the last quarter of the fifteenth century, it is influenced by Islam brought by Muslim traders from China, Gujarat, Arabia and also from Islamic kingdoms in the region, such as Samudra Pasai and Champa.

The sultanate is the first Muslim state in Java, and at one time dominates most of the northern coast of Java and southern Sumatra.

Despite its short period, the sultanate plays an important role in the establishment of Islam in Indonesia, especially on Java and in neighboring areas.