Sulham and Tidmarsh Woods and Meadows is a 75.7-hectare (187-acre) biological Site of Special Scientific Interest west of Reading in Berkshire.

Much of the southern part of the site is the Berkshire, Buckinghamshire and Oxfordshire Wildlife Trust's Moor Copse Nature Reserve.

The whole site lies within the North Wessex Downs Area of Outstanding Natural Beauty.

The site is in a broad valley of unusually varied alluvial loams, gravel terraces and peat deposits, resulting from flooding in late glacial times by an enlarged River Kennet.

The variety in soils and topography results in a mosaic of damp copses and seasonally flooded meadow communities, maintained here by a long history of coppicing and sympathetic grassland husbandry.