Stewart Island is an island of the Andaman Islands. It belongs to the North and Middle Andaman administrative district, part of the Indian union territory of Andaman and Nicobar Islands. The island lies north of Port Blair. Its population only consists of two people.
The island belongs to the Stewart Sound Group and lies between Dottrel island and Curlew Island. The island is small, having an area of .
Politically, Stewart Island, along neighboring Stewart Sound Group Islands, is part of Diglipur Taluk.
Ferry service is available from Mayabunder, on demand.
There is only 1 village, located at . According to the 2011 census of India, the Island has 1 households. The effective literacy rate (i.e. the literacy rate of population excluding children aged 6 and below) is 100%.