Butterley Reservoir is a reservoir in Derbyshire, England. The reservoir was built to provide water for the Cromford Canal which opened for use in 1794. The Codnor Park and Butterley Park reservoirs also provided water to the Cromford Canal. The currently disused Cromford Canal passes beneath the reservoir along the Butterley Tunnel. When the canal tunnel was in use water was provided to the canal directly from the reservoir via an adit which connects to the Butterley tunnel.