St. Theresaâ€™s Girls Secondary School had a humble beginning, as a primary School in 1935, with two distinct sections, the Girls Boarding section and Boys Day section, with two Headteachers in the church compound.
As the population of the twin sections of the school increased, it became necessary to separate the Boys from the Girls. The Boys moved to Kibuye mixed primary school.
In 1986, the Catholic Church together with a group Kisumu Catholic faithful, calling themselves Kisumu Catholic Education Society, came up with the idea of providing Secondary Education for Girls. This bore fruit in 1987 when the School was registered as a single stream Boarding Secondary School. In order to give room, the Girls primary was moved to a new site, renamed St. Maryâ€™s primary school to avoid confusion.
The initial infrastructure the school used were inherited from the two primary schools. the need for building facilities arose. The Archdiocese of Kisumu came in handy and put up a dormitory named St. Joseph and a multi-purpose hall attached to a kitchen .
Between 2000 â€“ 2005, the school population increased, other buildings were required, in 2000 the first fund raising was done, together with the schoolâ€™s savings, two Laboratories and four classrooms were constructed named Austin Orowe Wing.
In order to address congestion in the dormitory. The Board sought assistance from the Franciscan Brothers in Germany, the donation was used to put up storey dormitory named St. Francis in 2004.
Kisumu Town West constituency has not been left behind in the school development plan. In order to address classrooms needs of the School, the constituency development fund committee accepted to construct a two storey building made up of 12 classrooms. So far the ground floor is complete with four classrooms currently in use. To date Kenya shillings four million three hundred thousand (Kshs. 5,300,000/=) has been disbursed from the constituency fund towards this project.
The year 2008/2009, the school bought a 51 seater bus and sunk a borehole. The borehole has eliminate the perennial water scarcity.
THE school continues to do well in curricula and co curricula activities as seen in the ever improving results and performance in games and drama/music.
Past Principals included Sr. Goretty, Sr. Rosemon kirui(upto 2006), Sr. Barbara Okuma(2007-2010) andÂ currently
Sr. Margaret Lydia(2011- DATE)