The River Boyd is a river of some 7 miles (11 km) in length which rises near Dodington in South Gloucestershire, England. It is a tributary of the Bristol Avon, running in a southerly direction and joining near Bitton. The flow rate at Bitton is an average 19.8 cubic feet per second (0.56 m3/s). It was immortalised in the 1613 poem by John Dennys of Pucklechurch The Secrets of Angling, the earliest English poetical tract on fishing: