The Fitzmaurice River is a 276 km long river in the Northern Territory of Australia.
The river drains into the Joseph Bonaparte Gulf in the Timor Sea from a source just north of the Wombungi homestead. The river flows in a westerly direction between the Wingate mountains to the north and the Yamberra Mountains to the south. The area is quite remote and largely unsettled, and the river itself forms the southern boundary of the township of Wadeye.
The estuary formed at the river mouth is tidal in nature and in near pristine condition.
The drainage basin occupies an area of 10,375 square kilometres and is wedged between the catchment areas for Victoria River to the south and Moyle River to the north. The river has a mean annual outflow of 1,600 gigalitres.
A total of 16 species of fish are found in the river including the glassfish, Macleays glassfish, fork-talked catfish, fly-specked hardyhead, mouth almighty, spangled perch, barramundi, oxeye herring, rainbowfish, exquisite rainbowfish, northern trout gudgeon, bony bream, catfish, and the seven-spot archerfish.
A large number of crocodiles—both saltwater and fresh—inhabit the river. Wild cattle and bush pigs can be found in the surrounding countryside.
