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North Sydney Girls' High School (abbreviated as NSGHS, more commonly known as NSG) is a government funded single sex academically selective secondary day school for girls, located in Crows Nest, in Sydney, New South Wales, Australia. Established in 1914, the school caters for approximately 910 students from Year 7 to Year 12. Admission to the school is based entirely on academic results through the Selective High Schools Test undertaken by students in Year 6. In 2001, The Sun Herald ranked North Sydney Girls High School first in Australia's top ten girls' schools, based on the number of its alumnae mentioned in the Who's Who in Australia. In 2022, North Sydney Girls High School ranked as the fourth high school in the state, based on the percentage of exams sat that achieved a Distinguished Achievers (DA)

North Sydney Girls' High School was officially founded in 1914 with an enrolment of 194 students. The school was originally located on the corner of Hazelbank Road and the Pacific Highway (where Cammeraygal High School (junior campus) is now situated). By the 1980s, it was felt that the site could no longer meet the needs of the school, and years of intense lobbying for improved facilities followed. When the New South Wales Government decided to close Crows Nest Boys High School, the facility was transferred to North Sydney Girls. In December 1993, North Sydney Girls High officially moved to its current location, following a $6 million building and renovations project.

North Sydney Girls is an academically selective high school; admission to the school for Year 7 is determined by results in the Selective High Schools test, which is open to all Year 6 students in NSW. A small number of students from other high schools are accepted into years 8 to 12, with applications made to the school to sit for an entrance exam.

At North Sydney Girls High School, awards are given based on academic performance, sport performance, service to school and other merits across all years.

The school performs well in public examinations, and in recent years has been placed as the leading girls' school in New South Wales in the Higher School Certificate (HSC) examinations. Annually, at least 30% of Year 12 students achieve places in the top 1% of the HSC.

North Sydney Girls High School is registered and accredited with the New South Wales Board of Studies, and therefore follows the mandated curriculum for all years.

NSGHS offers a diverse range of extracurricular activities.

NSGHS has a theatresports troupe, junior drama ensemble, Year 10 drama night, and various clubs available to seniors. Instrumental ensembles and bands include the advanced string ensemble, stage (jazz) band, jazz ensemble, concert band, symphony orchestra, wind orchestra, wind ensemble, and beginner band. Choirs and vocal ensembles include Year 7 choir, junior choir, intermediate choir, combined (NSGHS & NSBHS) choir, senior vocal, and the a capella group.

Co curricular sports include basketball, skiing, hockey, cricket, badminton, table tennis, taekwondo, rowing, kayaking, touch football, water polo, fencing, netball, tennis, and volleyball. NSGHS also has a chess club, dance ensembles, and a cadet program at Marist Catholic College North Shore, and has had students participate in the Duke of Edinburgh Award Scheme.