凯恩舍姆（Keynsham）英格兰西南部的一个城镇和民政教区，属于索美塞特郡，靠近布里斯托尔和巴斯，人口约有16,000人。

Keynsham /ˈkeɪnʃəm/ is a town and civil parish between Bristol and Bath in Somerset, south-west England. It has a population of 16,000. It was listed in the Domesday Book as Cainesham, which is believed to mean the home of Saint Keyne.

The site of the town has been occupied since prehistoric times, and may have been the site of the Roman settlement of Trajectus. The remains of at least two Roman villas have been excavated, and an additional 15 Roman buildings have been detected beneath the Keynsham Hams. Keynsham developed into a medieval market town after Keynsham Abbey was founded around 1170. It is situated at the confluence of the River Chew and River Avon and was subject to serious flooding before the creation of Chew Valley Lake and river level controls at Keynsham Lock in 1727. The Great Flood of 1968 inundated large parts of the town. It was home to the Cadbury's chocolate factory, Somerdale, which opened in 1935 as a major employer in the town.