St George Girls' High School (SGGHS) is a government-funded single-sex academically selective secondary day school for girls, located in Kogarah, in the southern suburbs of Sydney, New South Wales, Australia.

In June 1913 it was decided that Kogarah would be a suitable site for a new high school.

On 31 October 1914, the land occupied by the cottage ‘Harrow Villa’ was purchased from its owner.

This cottage with portable buildings added became the temporary St George Girls High School.

St George Girls High School officially opened in February 1916 with 143 students and nine teachers.