Gouthwaite Reservoir is in Nidderdale, North Yorkshire, England. It is one of many reservoirs in the area, others include Roundhill Reservoir and Angram Reservoir.

Nidderdale, historically also known as Netherdale, is one of the Yorkshire Dales in North Yorkshire, England. It is the upper valley of the River Nidd, which flows south underground and then along the dale, forming several reservoirs including the Gouthwaite Reservoir, before turning east and eventually joining the River Ouse.