Killarney Heights is a suburb of northern Sydney, in the state of New South Wales, Australia. Killarney Heights is 12 kilometres north-east of the Sydney central business district in the local government area of Northern Beaches Council. Killarney Heights is part of the Northern Beaches and also considered to be part of the Forest District, colloquially known as The Forest.
Killarney Heights has panoramic views of Middle Harbour from a few locations. The suburb is located on a peninsula bound by the waters of Middle Harbour to the south-west towards Roseville Chase and Bantry Bay to the east. Garigal National Park is on the eastern border.