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.

The River Test is a chalk stream in Hampshire in the south of England. It rises at Ashe near Basingstoke and flows southwards for 40 miles (64 km) to Southampton Water. Settlements on the Test include the towns of Stockbridge and Romsey. The river's valley gives its name to the local government district of Test Valley. Below the village of Longparish, the river is broadly followed by the Test Way, a long-distance footpath.