St Theresa's Convent School, Karnal was established in 1961 and is administered by the Bethany Educational Society, Mangalore, a Christian Religious Minority Institution The Bethany Educational Society, is registered under the Societies' Registration Act XXI of 1860 No. 17 of 1948 – 1949. Its head office is at Bethany Generalate, Mangalore. All the members of the Bethany Educational Society are catholic nuns belonging to the Congregation of the Sisters of the Little Flower of Bethany.

The Society runs formal and non formal educational institutions all over the country. Rt. Rev. Msgr. Raymond Francis Camillus Mascarenhas, the Founder of the Congregation of the Sisters of the Little Flower of Bethany, under whose patronage this school was established was consumed by an indefatigable zeal for the education of the poor and marginalized, especially the rural girls. He longed for the total emancipation of Indian women and was convinced that it could not be achieved without education.

His spirit of service was supported by a strong scaffolding of prayer and faith in God. He was a man of great vision and was compassionate towards the poor and marginalized. His penetrating vision enabled him to look far ahead, which directed his work to fulfil the future needs. The school is affiliated to the Central Board of Secondary Education. New Delhi. (Affiliation No. 530006/86)