Romsey, town (parish), Test Valley district, administrative and historic county of Hampshire, southern England. It is situated 9 miles (14 km) northwest of Southampton on the River Test.
The town is dominated by a massive Norman abbey, which replaced an earlier wooden church established for Benedictine nuns in 907 ce. (In 1539, in the wake of Henry VIII’s dissolution of monasteries, the abbey’s nuns were dispersed.) Romsey lies on the edge of the New Forest (historically one of the great royal hunting grounds of England), and east of the church there is a hunting lodge that was used by King John in 1210 and is now a museum. Near Romsey is Broadlands estate, which once belonged to the abbey. Its manor house (now a Palladian-style mansion) and grounds were radically transformed in the 18th century by architect Henry Holland and landscape architect Lancelot Brown. Broadlands was the home of 19th-century British Prime Minister Henry John Temple, 3rd Viscount Palmerston, and later of statesman Louis Mountbatten, 1st Earl Mountbatten.
Offshoot streams of the River Test snake through Romsey, a historic market town that remains a rural service centre and the site of some modern light industries. Romsey’s long tradition of brewing, dating from the late 18th century, was especially prevalent during the heyday of Strong and Co. of Romsey Ltd. The brewing company was registered in 1894 and was sold in 1969 to Whitbread, which ceased brewing in Romsey in 1981. Pop. (2001) 14,647; (2011) 14,768.