Darley is a suburb of Bacchus Marsh, Victoria, Australia located directly north of the central area across the Western Freeway.

Darley is located on the rural-urban fringe, the topography varies but is mostly undulating.

It began as a small agricultural settlement on the bend of the Lerderderg River in 1838 and was surveyed and proclaimed a town in 1861.

In recent decades Darley has rapidly grown and has become a major suburban area of Bacchus Marsh with a large number of housing estates and developments to the east south and north capitalising on Darley's proximity to the freeway.

A former Military camp "Camp Darley" was housed in the Darley area, accommodating US service personnel from many units including, 49th Fighter group, 5th Airforce, 808 Engineer Aviation battalion and 182nd Infantry regiment of task force 6814.