Fehendhoo (Dhivehi: ފެހެންދޫ) is one of the inhabited islands of Southern Maalhosmadulhu Atoll, code letter "Baa" in the Dhivehi alphabet and code letter "F-15" in English.

The island is 98.17 km (61 mi; 53 nmi) northwest of the country's capital, Malé.

This atoll is oval in shape and small, its greatest length being 10 miles.

The inner lagoon has a depth of 17 to 20 fathoms; it has a sandy bottom mixed with mud and clay.

In the Admiralty Charts, this atoll is named after James Horsburgh, hydrographer to the East India Company and author of the "Directions for Sailing to and from the East Indies, China, New Holland, Cape of Good Hope, and the interjacent Ports, compiled chiefly from original Journals and Observations made during 21 years' experience in navigating those Seas".