Flag of Idisamo
Idisamo (dark green) in the Kingdom of Trellin (light green)
Idisamo (dark green) in the Kingdom of Trellin (light green)
 • Total4,974,571
Area code(s)029

Idisamo (pronounced /ɪdɪˈsæmoʊ/), officially the Margraviate of Idisamo (Trellinese: Metlan Idisamo'ka), is a province of the Trellinese Empire. It is the ninth-least populous province in Trellin and Hysera and the eighth smallest by total area.

Idisamo is bordered to the north by Alyrum and Pelna, to the west by the Straits of Jajich and to the east by the Sea of Velar. Its landmass of approximately 12,393 km² is home to 4,974,571 people. The provincial capital is at Betria, on the northeastern border.

A large, low plateau defines Idisamo's geography, with the province's coastline consisting mainly of low cliffs broken by shingle beaches. Until the 1300s the plateau was covered almost entirely in dense rainforest, but much of this was then cleared for agriculture, which is an important industry in the province. Rich silver deposits can be found on the large western peninsula, and these have been mined for centuries by local peoples.