The Kybeyan River, a watercourse that is part of the Murrumbidgee catchment within the Murray–Darling basin, is located in the Monaro region of New South Wales, Australia. The river rises on the western slopes of the Great Dividing Range, near Greenland Swamp, and flows generally north and north-west, joined by three tributaries before reaching its confluence with the Numeralla River, near Warrens Corner; descending 317 m over its 36 km course.