Haberdashers' Monmouth School for Girls is an independent school in Monmouth, Wales. The school was established by the Worshipful Company of Haberdashers in 1892, and continues to enjoy their support.

It is part of a family of schools known as the Haberdashers' Monmouth Schools.^[2] Together with its brother school Monmouth School for Boys they collaborate for certain activities such as drama productions and certain Sixth Form courses.^[3] They also share a coeducational nursery, Agincourt School.^[4] The girls' school consists of Inglefield House (ages 7–11) and the Senior School.

The Good Schools Guide described the school as a "friendly school that produces feisty young women" and noted its "diverse extra-curricular education".^[5]

HMSG was founded in 1892 by the Worshipful Company of Haberdashers. It opened in temporary premises at Hardwick House while the Company negotiated for a permanent location. In 1897 it moved to its present location. The main block was designed by the Haberdashers’ in-house architect, Henry Stock.^[6] Both the girls' school and its brother school Monmouth School became direct grant grammar schools in 1946 under the Education Act 1944 and became independent when the scheme was phased out. The prep school, Agincourt, was added in 1997.^[7]

Each girl belongs to one of the four houses, which are named after former members of the Board of Governors. The house system is separate from boarding houses.^[8]

Girls aged 7 and above may board. Boarders reside in three main houses: School House (Years 3-8),^[9] Twiston Davies (Years 9-11) and Augusta House (Sixth Form, Years 12–13).^[10]

HMSG is one of Wales' top performing independent schools.^[11][12] In the GCSEs ranked second in the country in 2010 with a 100% pass rate^[13] and came third the following year.^[14]

Girls are encouraged to take part in extracurricular activities and non-academic pursuits. There is a wide array of activities, groups, clubs and societies and sports teams that pupils may join.^[15] It became the first school in the country to employ a sports psychologist.^[16]

The Monmouth School for Girls Rowing Club and lacrosse team have been successful in recent years and team members have represented Wales in school and national competitions.^[17][18] In 2006 both the first and second lacrosse teams won the senior titles in both their categories for the first time in school history^[19] and in 2008 the first team was ranked in the top 4 in the United Kingdom and came first in their division.^[20] In 2012 several girls were chosen for the Wales lacrosse team for the Home Nations U19 championships.^[21] The Junior U16 rowing team won the Schools' Head of the River Race in the eights category.^[22]

• Jackie Ballard – Former MP and Director General, RSPCA. CEO of RNID
• Marina Diamandis – singer-songwriter (stage name Marina and the Diamonds)^[23]
• Jane Glover – conductor and musicologist
• Jenny Harries - Chief Executive of the U.K. Health Security Agency
• Sandra Huggett – actress
• Katrina Jacks – Commonwealth Rowing Championships Medallist^[24]
• Zoie Kennedy – actress
• Jemima Phillips – Official Harpist to the Prince of Wales (2004–2007)
• Lisa Rogers – Channel 5 TV Presenter
• Laura Tenison - founder of JoJo Maman Bébé

• Monmouth School (for Boys)