Goonhilly Satellite Earth Station is a large radiocommunication site located on Goonhilly Downs near Helston on the Lizard peninsula in Cornwall, England. Owned by Goonhilly Earth Station Ltd under a 999-year lease from BT Group plc, it was at one time the largest satellite earth station in the world, with more than 30 communication antennas and dishes in use. The site also links into undersea cable lines.

Goonhilly Downs is a Site of Special Scientific Interest (SSSI) that forms a raised plateau in the central western area of the Lizard peninsula in southern Cornwall, England. It is one of 229 English national nature reserves designated by Natural England with an area of almost 1,270 hectares.