Nicholsina is a genus of marine ray-finned fishes, parrotfishes from the family Labridae.

They are found in the Atlantic and eastern Pacific Oceans.

The generic name honours the American ichthyologist John Treadwell Nichols (1883-1958) who was curator of fishes at the American Museum of Natural History.

[2] There are currently three species classified in the genus:[2]

This Labridae article is a stub.