Loreto House was established in 1842 in Kolkata, by the Sisters of Loreto belonging to the institute of the Blessed Virgin Mary. It is the oldest and the first Loreto institution to be established in India and was one of the few all-girls Catholic schools of that time. The School started with sixty students who were taught at a house where nuns lived under Mother Delphine Hart, assisted by Sr. Teresa Mons and Sr. Martina McCann.