The liberty molly (Poecilia salvatoris) is a fish species from El Salvador.

[3] Maximum length is about 3 inches (7.6 cm), with females generally larger than males.

[3] According to Dr. William T. Innes, who regarded the species as color variety of P. sphenops, the liberty molly was first imported for the aquarium hobby in 1935.

[5] In the aquarium, the liberty molly can be aggressive towards other tankmates and nip the fins of other fishes in the tank.

[3][5] According to Innes, this aggressiveness and the loss of color intensity over captive generations led to the fish losing popularity in the hobby.