Neobirsteiniamysis is a mysid crustacean genus of the subfamily Boreomysinae of the family Mysidae.

[1][2] The eyes are lacking cornea, concave laterally, with the microfibrous microstructures on the concave surface.

[1][3] Type species of the genus is Petalophthalmus inermis Willemoes-Suhm, 1874.

The name comes from the neo- (Greek new) and Birsteiniamysis (the unavailable genus-name, replaced by Neobirsteiniamysis).

[1][4] Includes 2 species: Neobirsteiniamysis is bathyal-abyssal genus, and thus combines exclusively deep-water oceanic mysids.