St Andrew's Castle was an artillery fort constructed by Henry VIII near Hamble-le-Rice, Hampshire, between 1542 and 1543. It formed part of the King's Device programme to protect against invasion from France and the Holy Roman Empire, and defended Southampton Water near the Solent. St Andrew's comprised a keep and a gun platform, protected by a moat. The castle was decommissioned in 1642 during the English Civil War and has been largely destroyed through coastal erosion.

Hamble-le-Rice, commonly known as Hamble, is a village and civil parish in the Borough of Eastleigh in Hampshire, England. It is best known for being an aircraft training centre during the Second World War and is a popular yachting location. The village and the River Hamble also featured in the 1980s BBC television series Howards' Way. The village centre, known as The Square, Hamble, has a more traditional English village aesthetic which differentiates it from the small industrial areas close to the village.