Hornsby Heights is a suburb of northern Sydney, in the state of New South Wales, Australia. Hornsby Heights is located 27 kilometres north-west of the Sydney central business district, in the local government area of Hornsby Shire and is part of the North Sydney region.

Hornsby Heights lies to the north of Hornsby. The suburb's northern boundary and western boundary are defined by Berowra Creek, as far south as Galston Road. South of Galston Road, the western boundary, falls generally west of Berowra Creek. Walls Gully forms the eastern boundary. The southern boundary of Hornsby Heights is north of the Hookhams Corner locality. The following localities are in Hornsby Heights: Black Ash, Outlook, Galston Gorge, Montview, Somerville, Rofe Park.

The name Hornsby is derived from Convict-turned-Constable Samuel Henry Horne, who took part in the apprehension of bushrangers Dalton and MacNamara on 22 June 1830. In return he was granted land which he named Hornsby Place.

At the 2011 census, there were 6,192 residents in Hornsby Heights. The majority of people were born in Australia and the most common ancestries were English, Australian and Irish. The median weekly household income was high at $2,053. Most dwellings were separate houses and these tended to be large, with 50.9% having 4 or more bedrooms. Home ownership was popular, with 38.8% of people owning their home outright and 51.3% paying off a mortgage. The median monthly mortgage payment was $2,383 and this was higher than the national figure of $1,800.

Hornsby Heights is dominated by parks. The suburb is encircled by the Berowra Valley Regional Park. Parks within Hornsby Heights are Rofe Park and Montview Oval. Rofe Park is located on Galston Road and has a leash-free dog area. Crosslands Reserve, a camping and picnic area is at the northern end of Hornsby Heights. Hornsby Heights also contains small parks such as Ulolo, off Galston Road, and Leonora Close Park, off Sommerville Road. Many of these can be found around various quiet streets.

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