剑尾鱼属是一种淡水鱼，包括很多养在鱼缸里的热带鱼。

Xiphophorus is a genus of euryhaline and freshwater fishes in the family Poeciliidae of order Cyprinodontiformes. The many Xiphophorus species are all called either platyfish (or platies) or swordtails. The type species is X. hellerii, the green swordtail. Platyfish and swordtails are live-bearers, meaning that they reproduce via internal fertilization. The name Xiphophorus derives from the Greek words ξίφος (dagger) and φόρος (bearer), referring to the gonopodium.