| Secondary Boarding School | |
| Established: | 1969 |
| Type: | Private co-ed day and boarding secondary school |
| Affiliations: | Ministry Of Education (Nepal)] |
| Headmaster: | Mr. Dheejan Babu Kaphle (Dharan) |
| Founder: | Mr. Edmund Atal |
| Head: | Arun Kumar Jha (Itahari) |
| Head Label: | Officer in charge |
| Grades: | Class Nursery to X |
| City: | Dharan, Itahari |
| State: | Koshi |
| Country: | Nepal |
| District: | Sunsari |
| Student Union: | Secondarian |
| Nickname: | SBS |
| Free Label: | Emblem |
Secondary Boarding School is an English medium school, located in Dharan and Itahari, Nepal.
Secondary Boarding School was founded and established by Mr. Edmund Atal (Alital) Singh in 1969 located at Laxmi Sadak, Dharan, Sunsari. It was the first privately owned English medium School in Eastern Nepal. Later it extended its branch in Itahari, Sunsari.
Itahari Branch of Secondari Boarding School was established on 2022 B.S. Since then it has been established as one of the pioneer of educational system in Itahari area. Many students passed out from this institution are working and studying in different parts of world. The headmistress of Itahari branch is Mrs. Mina Subba. But the daily office administration is run by Mr. Arun Kumar Jha. It runs the class from Nursery level to Class 10.