Romsey Abbey is a parish church of the Church of England in Romsey, a market town in Hampshire, England. Until the dissolution it was the church of a Benedictine nunnery. It is now the largest parish church in the county since Christchurch Priory is now in Dorset.
The church was originally built during the 10th century, as part of a Benedictine foundation. The surviving church is the town's outstanding feature, which is all the more remarkable because the abbey, as a nunnery, would have been less well financially endowed than other religious establishments of the time.