The Menza (; ) is a river in Zabaykalsky Krai in Russia, and Töv Province, Mongolia. It is the largest tributary of the Chikoy. Its length is . The area of its basin is .
The Menza has its source in the northern part of the Khentii Mountains in Mongolia. It flows across mountainous areas, first northeastwards, entering Zabaykalsky Krai, then bends to the northwest across the western edge of the Khentei-Daur Highlands, joining the Chikoy on its left bank. The Burkal (ÃÂÃÂÃÂúðû) is its most important tributary.