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River in northern New South Wales, Australia

The Tweed River is a river situated in the Northern Rivers region of New South Wales, Australia. From the middle reaches of its course, the state boundary between New South Wales and Queensland is located approximately north. The river rises on the eastern slopes of the Great Dividing Range; with its watershed bordered by the McPherson, Burringbar, Condong and Tweed ranges and containing a catchment area of The river flows generally north east, joined by eight tributaries including the Oxley and Rous rivers before reaching its mouth at its confluence with the Coral Sea of the South Pacific Ocean, south of Point Danger; descending over its course. Yugembah (also known as Yugumbir, Jugambel, Jugambeir, Jugumbir, Jukam, Jukamba) is one of the Australian Aboriginal languages in areas that include the Tweed River Valley, Gold Coast, Logan, Scenic Rim, Albert River, Beaudesert, Beenleigh, Coolangatta, Coomera, Logan River, Pimpama and Tamborine, within the local government boundaries of the City of Gold Coast, City of Logan, Scenic Rim Regional Council and the Tweed River Valley.

The first training walls were built in 1891. Between 1898 and 1904, training walls were constructed from Chinderah to the entrance. In 1962, these walls were extended in order to maintain a deep channel. The order failed to stop the channel from shoaling and instead necessitated regular dredging and completely inhibited the longshore transport of sand northwards. In 2001, an artificial sand bypass system was implemented, in part based on the successful operation of the Gold Coast Seaway. South of Mount Warning, Doon Doon Creek and Perch Creek enter the Tweed from its southern banks, and Byrill Creek joins on the northern side near Terragon. Downstream, Korumbyn Creek and then the Oxley River enters the river at Byangum, before it flows through Murwillumbah. flooding, brought about due to the storm's residual effects and associated monsoon trough that passed over parts of Queensland and New South Wales. The river peaked at , the highest level recorded in 30 years. In late March 2017 rainfall from Ex Tropical Cyclone Debbie caused major flooding in the Tweed Valley, the Murwillumbah gauge recording a peak of 6.2 metres.

There is a sand bypassing system operating at the mouth of the Tweed River. A jetty on the northern end of Letitia Spit that collects sand and then pumps it under the Tweed River to beaches in the neighbouring state of Queensland. Outlets for the Tweed River Entrance Sand Bypassing System include Duranbah Beach, Snapper Rocks East, Snapper Rocks West, Greenmount and Kirra. Dredging of the navigation entrance is also undertaken regularly as part of the overall sand bypassing program. The width of the Tweed River mouth is about
The Indo Pacific humpback dolphin reaches its southern extent of its distribution at the river mouth.