Darley is a residential suburb immediately north of and adjoining Bacchus Marsh. It is 50 km west of Melbourne. The name is thought to have been inspired by Darley in Derbyshire, England.
Darley is on the Lerderderg River and a quarry was operated in the 1860s near where the river is joined by Goodmans Creek. In addition to freestone from the quarry, a firebrick factory was opened in the 1880s (later Darley Refractories in Grey Street).