The Richmond River is a river in the northeastern corner of New South Wales, Australia. It runs for approximately 170 kilometres from the foothills of the Border Ranges past the towns of Kyogle, Casino, Coraki, Woodburn , where it turns northward and empties into the Pacific Ocean at Ballina.

It is one of the three rivers that are generally considered to constitute the Northern Rivers district of New South Wales, the other two being the Clarence River to the south and the Tweed River to the north.

It is only navigable for a short way up its length, possibly as far as Coraki.

It is heavily used for irrigation along its length. Several weirs have been constructed in order to mitigate the effects of flooding, most notably at Casino.