射纹龟（学名：Astrochelys radiata，英文名称﹕Radiated tortoise）又名辐射龟，属于陆龟科，濒临绝种的爬虫类之一。原是马达加斯加南部的特有种生物，后来被引入到留尼汪和毛里求斯本种之所以濒临绝种，主要原因来自于栖息地的破坏和人类的偷猎。

一只名叫Tu'i Malila的射纹龟是有记载中最长寿的龟之一，牠出生于1777年前后，死于1965年5月19日，寿命最少有188岁。

The radiated tortoise (Astrochelys radiata) is a species in the family Testudinidae. Although this species is native to and most abundant in southern Madagascar, it can also be found in the rest of this island, and has been introduced to the islands of Réunion and Mauritius. As the radiated tortoises are herbivores, grazing constitutes 80-90% of their diets, while they also eat fruits and succulent plants. A favorite food in the wild is the Opuntia cactus. They are known to graze regularly in the same area, thus keeping the vegetation in that area closely trimmed. They seem to prefer new growth rather than mature growth because of the high-protein, low-fiber content. These tortoises are, however, endangered, mainly because of the destruction of their habitat by humans and because of poaching.