Scolichthys greenwayi is a species of freshwater fish of the family Poeciliidae.

[1] Its specific epithet refers to James Greenway.

[2] Rosen described Scolichthys greenwayi as having a diffuse and dusky midlateral stripe with a large dark blotch in front of the dorsal fin's origin.

Above this stripe, the species has a reticulate pattern, and below it, the side is a brilliant blue with a lead-white lower belly.

[1] Scolichthys greenwayi is a livebearing fish with a gestation period of 28 days, after which it produces ten to thirty young.