Langstone is a village near Havant, Hampshire in the south east of England in Portsmouth. It has good railway connections to London, Southampton, Portsmouth and Brighton, from the nearby Havant railway station. There are many large gated detached houses on the main road, "Langstone Road" and on the roads surrounding this. It has a sailing club, several architecturally unusual buildings, and several historically significant buildings, including a converted (water) millhouse and a converted 18th century windmill, the latter of which is a local landmark.

Havant is a town in the south-east corner of Hampshire, England between Portsmouth and Chichester. Its borough comprises the town (45,826) and its suburbs including the resort of Hayling Island as well as Rowland's Castle, the larger town of Waterlooville and Langstone Harbour. Housing and population more than doubled in the 20 years following World War II, a period of major conversion of land from agriculture and woodland to housing across the region following the incendiary bombing of Portsmouth and the Blitz.