The Dobunni were one of the Iron Age tribes living in the British Isles prior to the Roman conquest of Britain. There are seven known references to the tribe in Roman histories and inscriptions.

Corinium Dobunnorum was the Romano-British settlement at Cirencester in the present-day English county of Gloucestershire. Its 2nd-century walls enclosed the second-largest area of a city in Roman Britain. It was the tribal capital of the Dobunni and is usually thought to have been the capital of the Diocletian-era province of Britannia Prima.