The school is located at Malbasey, between Chakung and Soreng. It is situated on a plot of land leased by the Govt. of Sikkim. It was the idea of Chief Minister Mr N B Bhandari, to have a school at Malbasey his home town. On 13th October 1989 the foundation stone was laid by him for the school, in presence of Bishop Eric Benjamin and the local people. The new school was christened St. Mary’s School.
The Bishop approached the Salesians of Don Bosco, asking them to manage the school. Classes began on 26th March 1990, with 49 children of UKG. Class one was conducted in the Dak Bungalow. Fr T V George purchased more land for the expansion of school building. In March 1991, the name of the school from St. Mary’s School was changed to Don Bosco School. The school is a minority institution recognized by the Education department of the Govt. of Sikkim. The school is full-fledged co-educational school from Lower KG to class 12. It is affiliated to ICSE and ISC, New Delhi.
The school auditorium was inaugurated by Chief Minister Shri Pawan Chamling on Saturday 15th November2003. There were 635 students on the roll in 2016. Fr Martin Lakra is the Rector of the school. The school has 35 teaching staff and 30 non teaching staff. Five buses transport the students.