Croker's Hole is a 4.4 hectare biological Site of Special Scientific Interest north of Upper Lambourn in Berkshire. The site is a narrow grassland valley, which is one of the most florally diverse chalk downlands in Berkshire. The dominant plants are upright brome and tor-grass, and it is the only site in the county which has the nationally scarce bastard toadflax. There is access from a footpath from Seven Barrows to Hangman's Stone.