The Andoma (Russian: Андома) is a river in Vytegorsky District of Vologda Oblast in Russia. It flows out of Lake Groptozero and is a tributary of Lake Onega. It is 156 kilometres (97 mi) long, and the area of its basin 2,570 square kilometres (990 sq mi). The main tributary of the Andoma is the Samina River (right).