New River Head is a historic site located adjacent to Sadler's Wells Theatre on Rosebery Avenue and Amwell Street in the Clerkenwell area of London, England. Originally it was the London terminus of the New River, an artificial watercourse opened in 1613 to supply water to London. Subsequently the site also became the headquarters for the New River Company, the owners of the New River, and for its successors, the Metropolitan Water Board, the Thames Water Authority and Thames Water plc.

The Thames Water Ring Main is a system of approximately 80 km (50 mi) of concrete tunnels which transfer drinking water from water treatment works in the Thames and River Lea catchments for distribution within central London.