Cirencestertown (“parish”parish), Cotswold district, administrative and historic county of Gloucestershire, England, southwest-central England. It lies on the River Churn and is the administrative centre for the district.

Cirencester occupies the site of the Romano-British Corinium, capital city of the Dobuni tribe, at the junction of the important Roman and British roads known as Fosse Way, Ermine Street, and Akeman Street. The walls enclosed a town of 240 acres (100 hectares); , and remains of a basilica, an amphitheatre, and many rich villas have been discovered. The town was the largest in Roman Britain after London and was probably a capital in the 4th century. The Corinium Museum houses a Roman collection.

Saxons captured the town in 577, and it later became a royal demesne. Henry II (reigned 1154–89) leased the manor to the abbot of a local Augustinian foundation, who obtained charters for what became famous wool fairs in 1215 and 1253. The abbey was destroyed at the dissolution of the monasteries (1536–39) under Henry VIII, and an Elizabethan mansion was built on its site; the grounds are now a public park. A grammar school was founded in 1461; , and there is also the Royal Agricultural College. The parish church, although Norman in origin, is mainly in Perpendicular style. Cirencester today is primarily an agricultural and tourist centre. Pop. (2001) 23,49318,324; (2011) 19,076.