Hounslow Heath is a public open space and local nature reserve in the London Borough of Hounslow. It now covers about 200 acres (80 ha), what is left of the historic Hounslow Heath that covered over 4,000 acres (1,600 ha).
Bronze Age spearheads, axes, and sword and knife fragments from Hounslow, are held at The British Museum, also Celtic badges and amulets discovered in a field at Hounslow in 1864. In 1999, excavations on the former Feltham Marshalling Yards to the south of the heath unearthed remains of an Iron Age furnace and post holes from a round house. There are various remains of former mills and other industrial archaeological features adjoining The River Crane near the heath. This part of the river is classified as an Archaeological Priority Area.
The present Hounslow Heath is bounded by A315 Staines Road, A3063 Wellington Road South, A314 Hanworth Road, and the River Crane. The Heathland School is also behind it.
Hounslow Heath is a designated local nature reserve and Site of Metropolitan Importance for Nature Conservation, and is made up of lowland heath, dry acid grassland, woodland, scrub, neutral grasslands, wetlands, wildflower meadows, providing a wild, rugged country setting with a large network of paths.