Tweedmouth is part of the town of Berwick-upon-Tweed in Northumberland, England. It is located on the south bank of the River Tweed and is connected to Berwick town centre, on the north bank, by two road bridges and a railway bridge. Tweedmouth has historically always been part of England, in contrast to the walled town of Berwick which came under Scottish control for several periods in the Middle Ages. The local nickname for people from Tweedmouth is "Twempies". In 1951 the parish had a population of 6410.