Hammerwood is a hamlet in the civil parish of Forest Row in East Sussex, England. Its nearest town is East Grinstead, which lies approximately 3.5 miles (5.6 km) west from the village. The village is situated on the High Weald, on the East Sussex-West Sussex-Kent-Surrey border.

East Grinstead is a town in West Sussex, England, near the East Sussex, Surrey, and Kent borders, 27 miles (43 km) south of London, 21 miles (34 km) northeast of Brighton, and 38 miles (61 km) northeast of the county town of Chichester. Situated in the northeast of the county, the civil parish has an area of 2,443.45 hectares. The population at the 2011 Census was 26,383.