Montacute is a small town and suburb in Adelaide Hills, South Australia. The town is on Fifth Creek. It is mostly a rural area. Rostrevor is to the west of the suburb, while Lenswood is to the east, Castambul is to the north, and Norton Summit and Cherryville are to its west. The small town of Montacute Heights is on top of the ridge between Fifth and Sixth Creeks.