Ratna Rajya Secondary School (Nepali: रत्नराज्य माध्यामिक विद्यालय ) was established on 28 April 1960 (2017-1-16 B.S.) as a community based educational institution, which is located in Mid Baneshwor, Kathmandu, Nepal. It is affiliated to the National Examinations Board (NEB) and approved by the Ministry of Education. It offers Plus Two programs under Science, Management, Humanities, and Education streams.

Despite the foundation stone on 28 April 1960 (2017-1-16 BS..) of this school from the then Rural Development Minister Prem Prasad Angdambe. The education was started on 30 March 1962 (2018-12-17 BS). Pandit Shri Modanath Neupane had started the teaching work by educating some children. There was no school building. Under the supervision of Kamal Bikram Pandey, Chairman of the building sub-committee, an amount of Rs 8,000 was provided for the construction of the school by the then Shri. The name of this Ratnarajya Laxmidevi school is inaugurated from Badamaharani on 3 May 1964 (2021-1-21 B.S.). The school was established as a secondary school under the active support of the then headmaster Padma Singh Karki.

Even after four decades since the school was established, the school building was not able to stand on the land it owned. The school was traditionally operated. The choice of society started becoming a private school. It was necessary to modernize the school by improving the physical condition of the school and making timely changes in teaching. The collective efforts that have been made in this area for over a decade have changed the school a lot. From the 2008 AD year to 2018 AD, the number of students has reached 2200. By expanding the physical facilities enough, this number can be convinced that there will be more growth.