Elthorne was a hundred (ancient subdivision) of the ancient county of Middlesex, England. It covered the western part of the county and contained the following parishes and settlements: * Cowley * Cranford * Greenford * Hanwell * Harefield * Harlington * Harmondsworth * Hayes * Hillingdon * Ickenham * New Brentford * Northolt * Norwood * Perivale * Ruislip * Uxbridge * West Drayton Its territory roughly corresponded to the present London Borough of Hillingdon, plus the west of the London Borough of Ealing.