Olutanga is a Philippine island in the Moro Gulf, part of Zamboanga Sibugay Province. It is separated from the Zamboanga Peninsula in mainland Mindanao by a narrow channel and Tantanang Bay.
Olutanga, with an area of , is the largest island in the Moro Gulf and the 34th largest island of the Philippines. It has a shoreline length of .
The island is subdivided into 3 municipalities (Mabuhay, Talusan, and the namesake Olutanga), and has a total population of 103,701 people.