Blacktown Girls High School (abbreviated as BGHS) is a government-funded single-sex academically partially selective secondary day school for girls, located in Blacktown, a suburb of western Sydney, New South Wales, Australia.

Established in 1956 as the co-educational Blacktown High School, the school enrolled approximately 750 students in 2018, from Year 7 to Year 12, of whom three percent identified as Indigenous Australians and 85 percent were from a language background other than English. The school is operated by the NSW Department of Education in accordance with a curriculum developed by the New South Wales Education Standards Authority.

The school's brother school is Blacktown Boys High School.

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The school was originally established in January 1956 as Blacktown High School. However, owing to a growing local population and in accordance with government policy, it was decided that the schools would be split into two single sex schools: Blacktown Boys and Blacktown Girls High Schools. Both were fully split by 1959.

The school values sporting and creative achievements. For sports, the school has 4 house groups - Oodgeroo, Chisholm, Reibey and Fraser; named after prominent women in Australian history. In 2019, the Same Simpala memorial medal was established to honour talented students in the creative and performing arts.

• Nikita Ridgeway – tattoo artist and graphic designer
• Toni Collette – Actress

• List of government schools in New South Wales: A–F
• List of selective high schools in New South Wales
• Education in Australia

• Official website