Nash Mills is a civil parish within Hemel Hempstead and Dacorum Borough Council on the northern side of the Grand Union Canal, formerly the River Gade, and in the southernmost corner of Hemel Hempstead. There is evidence of a mill in this location since the 11th century and the row of 16th century mill cottages still remain. John Dickinson established a number of papermaking mills in the area in the 19th century.