Papercourt Marshes is a 10-hectare (25-acre) nature reserve in the borough of Guildford in Surrey.

[2] A roughly 50 hectares (120 acres) lake and associated surrounds, including the marshes totalling 20.0 hectares (49 acres) is designated a biological Site of Special Scientific Interest as Papercourt.

[1][3] This site has a variety of wetland habitats with marshes, unimproved meadows, streams and flooded gravel pits.

[4] The stream, and banks are rich in flora such as greater sweet-grass, reed canary grass and red pondweed.

[5] Access is limited to Papercourt Sailing Club, chosen ecologists and ornithologists.