Killarney Heights is a suburb of Northern Sydney, situated on Middle Harbour, 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.

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.

[2] This primary school is noted as having an extensive English – French bilingual program which has led to many French-speaking parents moving to the area.

The suburb east of Starkey Street became the site of considerable development by LJ Hooker in the early 1960s prior to the completion of the second Roseville Bridge in 1966.

[7] In February 1979, a Lithuanian couple who believed they were being chased by Soviet agents were discovered in bushland adjacent to the suburb.

A guide book called "Killarney Heights – Secrets of a Sleepy suburb" was published in November 2022.