Sladenia is a genus of marine ray-finned fishes belonging to the family Lophiidae, which includes the goosefishes, monkfishes and anglers.

[1] S. gardineri had a type locality of Salomon Atoll in the Chagos Archipelago of the Indian Ocean.

[2] The genus Sladenia is one of 4 extant genera in the family Lophiidae which the 5th edition of Fishes of the World classifies in the monotypic suborder Lophioidei with the order Lophiiformes.

[6] Sladenia goosefishes are found in the western Atlantic, Indian and Pacific Oceans.

The type species, S. gardineri, is found in the Chagos Archipelago in the central Indian Ocean[10] and has been recorded off New South Wales.