Romsey is a town in the Test Valley district of Hampshire, England. The town is situated 7 miles (11 km) northwest of Southampton, 11 miles (18 km) southwest of Winchester and 17 miles (27 km) southeast of Salisbury. It sits on the outskirts of the New Forest, just over 3 miles (4.8 km) northeast of its eastern edge. The population of Romsey was 14,768 at the 2011 census.

Test Valley is a local government district with borough status in Hampshire, England, named after the valley of the River Test. The council is based in the borough's largest town of Andover. The borough also contains the town of Romsey and numerous villages and surrounding rural areas. A small part of the borough at its southern end lies within the New Forest National Park, and part of the borough north of Andover lies within the North Wessex Downs, a designated Area of Outstanding Natural Beauty.