Fannie Bay is a middle/inner suburb of the city of Darwin, Northern Territory, Australia.
Situated in the suburb is the Fannie Bay Gaol museum, Fannie Bay Race Track and a monument to Ross Smith, captain of the Vickers Vimy, that on 10 December 1919, was the first aircraft to fly from England to Australia in less than 30 days. Adjoining the suburb is the East Point Reserve, containing Lake Alexander, a Military Museum and gun emplacements from the Second World War.
A great many places in the Northern Territory were named by John McDouall Stuart for members of the Chambers family, who sponsored his expeditions. Fanny (1841–1915) was the eldest daughter of John Chambers.