Alverstoke is a village in the borough of Gosport, on the south coast of Hampshire, England. It stretches east–west from Fort Blockhouse, Haslar to Browndown Battery, and is centred 0.5 miles (0.80 km) east of the shore of Stokes Bay and near the head of a creek which extends a mile westward from Portsmouth Harbour.

Gosport is a town and non-metropolitan borough, on the south coast of Hampshire, South East England. At the 2021 Census, its population was 81,952. Gosport is situated on a peninsula on the western side of Portsmouth Harbour, opposite the city of Portsmouth, to which it is linked by the Gosport Ferry. Gosport lies south-east of Fareham, to which it is linked by a Bus Rapid Transit route and the A32. Until the last quarter of the 20th century, Gosport was a major naval town associated with the defence and supply infrastructure of His Majesty's Naval Base (HMNB) Portsmouth. As such over the years extensive fortifications were created.