The area is situated on the northern peninsula of metropolitan Sydney, Australia, and lies within the Diocese of Broken Bay. The parish begins on part of the northern edge of Sydney Harbour, hence its name. The new parish has retained Saint Kieran (of Clonmacnoise in sixth-century Ireland) and Saint Cecilia (an early Roman martyr) as its patron saints.

The previous parish of Manly Vale was excised from the Parish of Manly in 1952, and in June 2006 embraced all or part of the suburbs of North Balgowlah, Manly Vale, Allambie Heights, Allambie, North Manly, Brookvale and Beacon Hill. From the beginning it has been conducted by the Order of Saint Augustine.

The previous parish of Balgowlah was founded in 1929, and in June 2006 included the suburbs of Balgowlah, Balgowlah Heights, Clontarf and Seaforth. It was conducted by diocesan priests until the year 2000, when Bishop David Walker invited the Order of Saint Augustine to minister there.

www.northharbourcatholic.org.au