The school was previously known as L.M.S. (London Missionary Society ). It was a boarding school with 24 boys only. It was 1832 when the school was established at Alipore. Later it was shifted to Bhowanipore. Later a female section was started in 1837. The male and female sections were on the same premises but run separately. The names which are to be mentioned in connection with the foundation and expansion of the school are -
1. Rev. J. Cambell and Mrs. Cambell 1832
2. Dr. Boaz 1837
3. Mrs. Mullens 1855
4. Mrs. Ashton 1861
5. Miss Linley 1879
The London Missionary Society of England is the founder of London Missionary Society School which later from 1916 came to be known as United Missionary Girls' High School when the Methodist Missionary Society and British Missionary Society of the United Kingdom joined with London Missionary Society. It was originally a Higher Secondary School but in 1979 it became Madhyamik School and again in June 1999 the school was upgraded to start Higher Secondary under W.B.H.S. Council. The school is still trying hard to retain the Missionary spirit and striving hard to infuse in the students the love for mankind and faith in God and enjoy peace and happiness in prayer. Morning Assembly is a special feature of our school. Hymns and Lord's prayer help to retain the Christian character of the Institution. For the resident students and staffs, the school has a chapel for Christian worship.

United Missionary Girls’ High School is a one hundred-seventy-year-old institution graciously spread over 10 acres. Once inside the school gates, one is completely shut off from the bustling noise of the city. The school grounds exude an old-world charm. Quaint buildings are tunneled with long arched corridors, shuttered doors and large windows open to the courtyard. Green deodars skirt the school walls, vibrant bougainvillas, bright alamanders and a perfumed bakul tree stand in the middle of the ground. The high school includes twenty-six classrooms, a library, a new computer lab, a canteen, a chapel, and an assemly hall where students gather in the morning for prayer and daily hymns. The primary school accomodates more than 1,000 children at five levels in nineteen classrooms. The school rooms surround a central courtyard.