Richmond-Tweed is one of a dozen regions into which people commonly divide New South Wales, a former British colony that is now the most populous state of Australia. One of the state's smallest regions, sometimes called "Northern Rivers", it is in the extreme north-east of the mainland portion of the state, south of Queensland's Gold Coast. It is the nearest mainland region to the offshore "region" Lord Howe Island.
Counties in New South Wales, as in most of Australia, have no statutory function except that they are used for defining land ownership and transfer. They may overlap region boundaries. This region contains all or part of the following counties: