Our school was first started in 1876 by Miss Angelina Hoare and Miss Milman, both missionaries from England and it was named Diocesan Mission School. In 1894, the administration of the school was handed over to the Sisters of the Community of John the Baptist Convent, Clewer, England, who named it St. John's Diocesan School. It gained Government recognition only in 1900. The first batch of students appeared for their Matriculation Examination in 1909. In the same compound, an offshoot of the High School, the Dio College was started. The St. John's Diocesan School is affiliated to the West Bengal Board of Secondary Education, and the West Bengal Council of Higher Secondary Education.