Poecilia parae, also known as the melanzona guppy, is a species of fish from the family Poeciliidae which is found in northern South America from Guyana to the mouth of the Amazon River.

Some of the morphs are always abundant in the wild, and others are invariably rare leading to the conclusion that the colour of the males has implications for their fitness.

It inhabits small swamps and shallow, slow-flowing creeks located inland with very fresh water.

It is also found along riverine vegetation where there is clear water and a bed of mixed sand and mud.

They are an ovoviviparous species and the females give birth to 5 to 15 live young after a gestation period of 24 days.