Hamstead Marshall (also spelt Hampstead Marshall) is a village and civil parish in the English county of Berkshire. The village is located within the North Wessex Downs. The population of this civil parish at the 2011 census was 275.

In the west of West Berkshire (a unitary authority area), south-west of Newbury, on the Berkshire-Hampshire border, the parish covers 7.78 square kilometres (3.00 sq mi), having lost territory in a boundary change of 1991. The village contains scattered settlements such as Ash Tree Corner, Chapel Corner, Holtwood and Irish Hill. There is a 12th-century[3]church (St Mary's), a Dogs Trust canine rescue kennels, the White Hart Inn, Hamstead Marshall's pub for several centuries. There is a village hall (until 1933 it was the village school) in which community events are held regularly, and it is also used for private bookings. The Organic Research Centre at Elm Farm closed in 2019 and its land and buildings sold off.

Hamstead Marshall has three sites of medieval motte-and-bailey castles, all on private land, with one a possible site of Newbury Castle. All are registered historic monuments.

William Marshall, who became Earl of Pembroke, was a loyal knight to four kings: Henry II, Richard I, King John, and Henry III of England and this is when the Marshall suffix was added to the village. The manor continued to be owned and used by kings and queens throughout the centuries, until it was sold in 1613.

The village was from 1620 until the 1980s the seat of the Earls of Craven. William Craven, 1st Earl of Craven (1608-1697) built a mansion there, originally intended as a residence for Charles I's sister, Elizabeth of Bohemia, although she died before construction began. It burnt down in 1718. The Cravens later expanded a hunting lodge to live in instead, and this still stands, privately occupied, in the centre of Hamstead Park. Until the mid-twentieth century the Craven family owned most of the village, but successive sales by the estate put almost all the houses into private ownership by 1980, most of them now owner-occupied. About 17 houses are owned by Sovereign Housing Association.