岩鬣蜥是岩鬣蜥属（Cyclura，又名圆尾蜥属或圆尾鬣蜥属）的蜥蜴，分布在加勒比地区。牠们是高度的特有种，在每一个岛上都只有一个物种或亚种。

岩鬣蜥属的学名是来自古希腊文的「圆尾」，取自牠们尾巴上的厚环，中文以圆尾蜥属翻译最接近。现时岩鬣蜥属共有9个已描述的物种及8个确认的亚种。

Cyclura is a genus of lizards from the family Iguanidae. Members of this genus are known as "cyclurids" or more commonly as rock iguanas and only occur on islands in the West Indies. Rock iguanas have a high degree of endemism, with a single species or subspecies restricted to individual islands.