Killarney Heights High School is a coeducational, comprehensive high school located on Starkey Street in Killarney Heights, a northern suburb of Sydney, in the Northern Beaches, Australia.

Academically, Killarney Heights High School has performed better in 2018 and 2019 than previously, ranking in the top 100 schools both years, for the first time. However, due to rising issues after COVID, the school (along with