Marsfield is a suburb in the Northern Sydney region of Sydney, in the state of New South Wales, Australia. Marsfield is located 16 kilometres north-west of the Sydney central business district in the local government area of the City of Ryde.

Northern Sydney is a large metropolitan area in Greater Sydney, New South Wales, Australia on the north shore of Sydney Harbour and Parramatta River. The region embraces suburbs in Sydney's north-east, north and inner north west. Northern Sydney is divided into distinctive regions such as the North Shore, Northern Beaches and Forest District.