Portesham, sometimes also spelled Portisham, is a village and civil parish in the county of Dorset in southwest England, situated in the Dorset Council administrative area approximately 6 miles (10 km) northwest of Weymouth, 6 miles (10 km) southwest of the county town Dorchester, and 2 miles (3 km) northeast of the Jurassic Coast World Heritage Site at Chesil Beach. The parish is quite large, covering several outlying hamlets and what were once their manors. In the 2011 census it had a population of 685 in 316 households and 342 dwellings.

Abbotsbury Abbey, dedicated to Saint Peter, was a Benedictine monastery in the village of Abbotsbury in Dorset, England. The abbey was founded in the 11th century by King Cnut's thegn Orc and his wife Tola, who handsomely endowed the monastery with lands in the area. The abbey prospered and became a local centre of power, controlling eight manor houses and villages. During the later Middle Ages, the abbey suffered much misfortune. In the time of the dissolution of the monasteries, the last abbot surrendered the abbey and the site became the property of Sir Giles Strangways.