Mosman High School, (abbreviation MHS) is a school located in Mosman, a suburb of Sydney, Australia, on Military Road.

It is a co-educational high school operated by the New South Wales Department of Education with students from years 7 to 12.

[6] From 1961 the site was shared between the schools until 1968 when Mosman Public School moved to a new site bordered by Belmont Road, Myahgah Street and Gouldsbury Street.

In the mid-1980s, there was speculation that the Department of Education and Minister for Education, Rodney Cavalier, were looking at closing Mosman High, along with the nearby Cremorne Girls High School, which was denied by Cavalier, who however said that the Lower North Shore of Sydney had "one high school too many".

[7][8] In July 1985, Cavalier announced that Cremorne Girls would be closed by mid-1987, with the remaining students transferred to Mosman High or Willoughby Girls High School.