St. Britto High School, Mapusa. commonly known as St. Britto or St. Britto's, is a private Catholic primary and secondary school for boys located in Mapusa, Goa, on the west coast of India. It was founded in 1946 and is run by the Society of Jesus (Jesuits). It is all-boys and includes nursery till grade ten. In 2017 all 142 graduates passed the secondary exam.

Indo-Portuguese historian Dr. Teotonio de Souza, part of the school's staff in the 1970s, says this was the third institution set up by the Jesuits in Goa. Its founding was assisted by Valentino Pinto, a wine-merchant of Mapusa. Initially, the school was called Sacred Heart High School. Its original owner faced difficulties in staffing and running it, and handed it over to the Jesuits on 22 June 1946, in Portuguese-ruled Goa. Dom Caetano Menezes, the owner of St. Mary's school nearby, also handed over his institution to the Jesuits. The school's name was changed to St. Britto High School on 18 May 1948.

Dr. Teotonio R. de Souza suggests that the reputation of the Jesuits in Goa had been on the rise with their management of Theotonio High School, owned by the Goa Archdiocese.

Fr. Sylvester D'Souza was the first principal of the schools taken over, and both were initially co-educational. The Jesuits transferred the girls from the schools to the Apostolic Carmel (AC) nuns, already active in education in Goa, who went on to form the St. Mary's Convent High School, also at Mapusa along the Altinho hilltop where St. Britto is itself located.

Initially, St Britto's functioned from the Bardez Gymkhana site. Priests running the school and boarders rented houses atop the hill, an inconvenient arrangement especially during Goa's torrential monsoons. The new site of the school was purchased from Cipriano da Cunha Gomes. The Goa Archdiocese assisted construction with a loan. Fr. Ubaldo de Sá, of Moira, is credited with the construction.

The school's large facade dominates the town of Mapusa from a distance.

The School Coat of Arms is divided thus:
At the top, against a field of blue, is the monogram of the Society of Jesus, in a golden sun: IHS (the Greek shortform for the name of Jesus), surmounted by a cross. Below that, against a field of golden yellow, are the palms of martyrdom, which pay tribute to the Patron of the School, St. John de Britto. A red chevron separates the lamp of learning (to dispel darkness and ignorance) at the bottom of the coat of arms. At the bottom is the school motto, "Facta non Verba" on the scroll below the coat of arms, which means Deeds Not Words.

The school has a Consumer Club and Eco Club, but emphasizes seasonal events and celebrations in which the whole school participates: Swachha Bharat Day, St. Ignatius day, Goa Liberation Day, and Christmas festivities including a carol competition.

Intramural sports include football, table tennis, badminton, chess, and basketball. Students are also trained after school hours in cricket, basketball, kabaddi, touch rugby, throw ball, net ball, sepak takraw, and boxing.

This article's list of alumni may not follow Wikipedia's verifiability policy. Please improve this article by removing names that do not have independent reliable sources showing they merit inclusion in this article AND are alumni, or by incorporating the relevant publications into the body of the article through appropriate citations. (April 2021)

• Late Francis D'Souza – former Deputy Chief Minister of Goa and Member of the Legislative Assembly.
• Ralph de Souza – chairman of Tourism and Travel Association of Goa.
• Noel de Souza – De Souza Group director and musician.
• Roy de Souza – director of Resicom Builders.
• Eric Menezes – Vice-President of the Goa-based CMM Group of Companies.
• Late Mario Pereira – proprietor of Paulo Holiday Makers, a prominent local transport company.
• Late August Braganza – musician, founded The Band and Symphony
• Alex Braganza – musician, played with The Band and Symphony.
• Lenny D' Gama – best international technical official 2017 Boxing Asia.
• Alan de Souza – Volvo Asia Pacific parts manager.
• Oscar C. Lobo – first Goan Councillor in Australia.
• Newton Marques – OHS inspector with the Australian Federal Government.
• Salvador Pinto – Bank of Goa manager.
• Maroj Pais – Assistant general manager at Automobile Corporation of Goa Limited (ACGL), Goa.

• List of Jesuit schools

• Britto's Old Boys' Association website
• Britto alumni webpage
• The Goa Jesuit Province of the Society of Jesus - The Jesuits in Goa
• Memoirs of a Britto boy
• Britto links on Google.com