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.

[4] The school pushes a heavy focus on teacher-parent communication, inclusivity, diversity, and student/teacher wellbeing.

The school has a large Band Program, which features over 8 ensembles, ranging from Jazz, to Symphonic, to Strings.

The school was established in January 1967 to serve the new suburb of Killarney Heights which was built in the early 1960s.

[5] The motto comes from an abbreviated quote from the writings of a late Old English abbot and Aelfric of Eynsham "a prolific writer of religious literature, including translations from the Bible, saints' lives and homilies.