The Dumaresq River is a perennial watercourse in the Northern Tablelands region of New South Wales and the Darling Downs region of Queensland, forming part of the Macintyre River catchment within the Murray–Darling Basin. The river forms a section of the border between New South Wales and Queensland.

The Dumaresq rises on the western slopes of the Great Divide, formed by the confluence of the Severn River and Tenterfield Creek east of Glenlyon Dam. It flows generally south-west then north-west for 214 kilometres to its confluence with the Macintyre River east of Boggabilla, gathering fourteen tributaries along the way.

The towns of Bonshaw, Texas and Yelarbon are on its banks.

Explorer and botanist Allan Cunningham named the river during his 1827 expedition, in honour of Lieutenant Colonel Henry Dumaresq, a relative of Ralph Darling, Governor of New South Wales at the time