High Halstow is a village and civil parish on the Hoo Peninsula in the unitary authority of Medway in South East England.

[1] Originally known as Hagelstowe (in Textus Roffensis), Hagelsto or Agelstow,[4] it was named from an Old English word denoting a high, holy place.

The 10th-century Grade I listed church of St Margaret at High Halstow [5] was mentioned in the Domesday Book of 1086, and was built on the highest point of the Hoo Peninsula, overlooking the rivers of the Thames and Medway.

The cause of malaria was discovered in 1890, and within five years the number of people falling ill with the disease decreased sharply as farmland and marshes were drained.

Churchill Place was developed and in the area behind the church, formerly known as the Square, several modern bungalows replaced five thatched cottages.

Chatham Dockyard and the Short Brothers seaplane works at Rochester were also traditional employers for the whole area until they shut many years ago.