Greenacres is a north eastern suburb of Adelaide, South Australia in the City of Port Adelaide Enfield. It is considered to be an inner suburb of greater Adelaide. Hampstead Road and Muller Road intersect at the south west corner of Greenacres making it a bustling area during rush hour. These form the western and southern boundaries of the suburb, with Fosters Road on the east and Redward Avenue on the northern boundary. The suburb also features Hampstead Barracks, a small suburban Australian Army base.