Canossa High School begun on 9th January, 2006 and it is owned by the "Canossian Sisters." The school started as a day school, hence in the beginning girls who joined the school mainly they come from Tegeta and its neighborhood. as the school started to grow, girls from far started joining the school and hence the school developed the need to look for a place to accommodate them. two hostels were immediately found near the school at the joint efforts of parents and the school Administration.
St. Magdalene of Canossa (the founder of Canossian Sisters) realize that, without a sound system of education, youth lacked the possibility of discovering their dignity as persons. She emphasized on education which took care of the total development of the person, with special emphasis on spiritual and moral values. Her special attention was toward the underprivileged of both rural areas and cities and the promotion of girls. Therefore, Canossa Secondary School started in Tegeta, Dar es Salaam was a response to the need of the society at the time; to form a girl child, holistically.