Streat is a village and parish in the Lewes district of East Sussex, England, 3 miles (4.8 km) south-east of Burgess Hill and 5 miles (8.0 km) west of Lewes, within the South Downs National Park.

The 11th-century parish church has no dedication; the ecclesiastical parish is joined with Westmeston.

Clayton to Offham Escarpment is a Site of Special Scientific Interest, which stretches from Hassocks in the west and passes through many parishes including Streat, to Lewes in the east. The site is of biological importance due to its rare chalk grassland habitat along with its woodland and scrub.

There is a lot of evidence of human activity, such as flint digging, working and cooking during the Atlantic period around seven thousand years ago. Archaeologists have suggested that forest clearances may have started earlier on the thinner soils of the Lower Greensand in places such as Streat, where flint tools from the period can be found in abundance.

As is true in most of the Weald, Medieval Streat had much common land for people to graze their animals, make hay and garner other resources. A quarter of the common was ploughed up in 1258. Much later, between 1600 and 1684, the rest of the main commons of Streat were enclosed. Before its nineteenth century enclosure there was a third arm to Streat Green which tracked south through Riddens Wood (TQ 358 170) down to Riddens Farm, by the railway line. The braided paths can still be made out in the wood. It used to be called "Chinese Wood" because there was a Chinese temple there. The temple is now gone, but its existence explains the presence of bamboo and other exotic plants in the wood, alongside the sessile oak, gean, hornbeam and a wild service tree on the western boundary still bears seasonal fruits. Now all that is left of the Commons are the two Streat greens, Streat Lane Green and Shergold's Farm Green, only parts of which are registered as common land, but remain open and public areas.

The Lower Greensand ridge is cut deep by the old swine pasture droves. Streat Lane itself is an example of such an ancient droveway, used by villagers to seasonally move their livestock and crops. The partial survival of archaic pasture vegetation on the linear greens gives evidence of this history.

Streat is a thin parish that stretches from Wivelsfield parish in the north to Falmer in the South Downs. It is squashed between Plumpton to the east and Westmeston to the west. For nearly two miles north of the Downs, Streat Lane is narrow and winding, sufficiently traffic free to make walking possible with care, with tall nutty hedgerows on either side.

It was forgotten for many centuries that Streat owed its name to the presence of a Roman road that cuts through the parish (Anglo-Saxon place names containing "Street", "Streat" or "Stret", usually indicate a Roman road). This road was re-discovered less than a century ago, and came to be known as the Sussex Greensand Way, though it is difficult to detect as it crosses Streat parish. There is also a north-south Roman or Romanised Celtic road known as the Middleton Track just over the west parish boundary border at Hayleigh Farm sweeping past Middleton Manor  which ascends the South Downs escarpment passing above the Victoria Jubilee Middleton Plantation