Vitim Nature Reserve () (also Vitimsky) is a Russian 'zapovednik' (strict nature reserve) in the mountains 400 km northeast of Lake Baikal in the Irkutsk region of Siberia. It covers the upper reaches of the Vitim River, a left tributary of the Lena River. The reserve protects a wide variety high-altitude, continental climate flora and fauna complexes: larch taiga, cedar thickets, mountain tundra, and sub-alpine meadows of the Kodar Mountains. The reserve is located in the southeast of the Bodaybinsky District of Irkutsk, 150 km east of the regional city of Bodaybo. It was formally established in 1982, and covers .