Majuli or Majoli is a river island in the Brahmaputra river, in the Indian state of Assam. Majuli is often erroneously cited as the largest river island in the world by the Indian media, but in fact it is merely the largest freshwater island in South Asia. Majuli occupies an area of about 577 km², having lost significant area due to erosion.

The island is about 200 kilometres east from the state's largest city — Guwahati, and is accessible by ferries from the town of Jorhat. The island was formed due to course changes by the river Brahmaputra and its tributaries, mainly the Lohit. Majoli is also the abode of the Assamese neo-Vaisnavite culture.