Barnstaple was a constituency centred on the town of Barnstaple in Devon, in the South West of England. It returned two Members of Parliament to the House of Commons of the Parliament of the United Kingdom until 1885, thereafter, one.

Barnstaple is a river-port town and civil parish in the North Devon district of Devon, England. The town lies at the River Taw's lowest crossing point before the Bristol Channel. From the 14th century, it was licensed to export wool from which it earned great wealth. Later it imported Irish wool, but its harbour silted up and other trades developed such as shipbuilding, foundries and sawmills. A Victorian market building survives, with a high glass and timber roof on iron columns.