St. Thomas, one of the twelve Apostles of Jesus Christ, came to India in 52 AD and established the Christian community in this glorious world. The Church established by him on the Indian soil strives to preserve the unbroken continuity of Christian faith, high ethical values and noble traditions without compromising its essential Indian culture and content. The Church has evolved as a dynamic and thriving body with a wide range of social activities based on love and service. With its unique contributions the Orthodox Church has left an imprint in the fields of education and medical care. 

 St. Thomas Mission High School, named after the Apostle, run by Mar. Gregorios Orthodox Syrian Church Society of Delhi Diocese is an integral part of the Indian Orthodox Church.

St. Thomas Mission School (Code No. UP-264) is a Christian minority School under the management of The Delhi Diocesan Council (Regd) of the Indian Orthodox Church. The school is recognized by the Directorate of Education, UP Government, and affiliated to the "COUNCIL FOR THE INDIAN SCHOOL CERTIFICATE" EXAMINATIONS (X and XII).

This institution is situated in Sec- H, Jankipuram – the central and posh locality of Lucknow and as such, is very convenient for parents/guardians seeking education for their children. The College has a well-maintained, spacious campus with artistic and imposing buildings, playgrounds and well-grown trees along the boundary, providing an atmosphere for good health and education.
It is equipped with modern laboratories, spacious classrooms, a well stocked library, indoor badminton courts, basket-ball and volleyball courts and extensive playgrounds for football, hockey, cricket with athletics and a well equipped computer lab. The College is the premier and prestigious Institution of the City and as such can compare favourably with the best institutions not only in Uttar Pradesh, but in the country.

The College aims at giving a value based wholesome quality education to develop along with intellectual excellence and achievement, the multi-faceted personality of the child as a moral and social being, with special emphasis to inculcate healthy moral values. Students are helped to become mature persons, imbibed with values to be worthy citizens of our country.