Lake Gusinoye (Russian: Гусиное озеро, Gusinoye ozero) is the name of a body of fresh water in the Republic of Buryatia, Russia. It is located about 120 kilometers from Ulan-Ude, the capital of the republic, and is close to the border with Mongolia. The town of Gusinoozyorsk is located on the northeastern shore of the lake. Tamchinsky datsan is located on the opposite bank, in the village with the same name as the lake, Gusinoye Ozero. Tamchinsky Datsan is one of the ancient Buddhist monasteries of Russia.