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.

[2] 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.

[1] The school is operated by the NSW Department of Education in accordance with a curriculum developed by the New South Wales Education Standards Authority.

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.