儒艮（学名：Dugong dugon）为海牛目儒艮科草食性海生动物，类似其海牛科（Trichechidae）近亲，但栖息地不尽相同，牠们是海牛目中唯一仍生存于印度洋与太平洋地区的物种。 和海牛科的圆尾鳍不同，儒艮的尾鳍近似于海豚的Y型尾，突出嘴外的长牙则近似其远亲大象，不过仍有很多人仍会混称海牛。 虽然牠们的分布范围广泛，某些地区仍有相当的数量，但在人类持续的猎杀、栖地减少以及困在渔网中溺毙的意外等已严重威胁到牠们的生存。 某些地区称牠们为海牛、海猪、或海骆驼。

The dugong (/ˈduːɡɒŋ/, /ˈdjuːɡɒŋ/; Dugong dugon) is a medium-sized marine mammal. It is one of four living species of the order Sirenia, which also includes three species of manatees. It is the only living representative of the once-diverse family Dugongidae; its closest modern relative, Steller's sea cow (Hydrodamalis gigas), was hunted to extinction in the 18th century. The dugong is the only strictly marine herbivorous mammal.