Test Valley is a local government district and borough in Hampshire, England, named after the valley of the River Test. Its council is based in Andover.
The borough was formed on 1 April 1974 by a merger of the boroughs of Andover and Romsey, along with Andover Rural District and Romsey and Stockbridge Rural District.
Test Valley covers some 250 square miles (650 km2) of western Hampshire, stretching from boundaries with Southampton in the south to Newbury in the north. Test Valley is a predominantly rural area. It encompasses the North Wessex Downs Area of Outstanding Natural Beauty.