Bethany High was started by Mr. and Mrs. Bagiire who bought land from Haji Mwanje in July-1999.In August-1999 construction started and by December 1999 four Blocks were already constructed. These blocks included the Administration Block and 3 class room blocks.

Two blocks were used as dormitories for both boys and girls respectively.On 3rd-December-1999 offices were officially opened and admissions started.The officially opened with 8 students with Mr. Masaba Godfrey as first Head teacher, Ms. Sowobi Mary as his Deputy, Mrs.Robinah Bagiire as Bursar, Mr. Tabu Francis as the Director of Studies (D.O.S). 2 Cooks, 3 Gate keepers, Librarian, Secretary, Office Messenger and a store keeper. By the end of 2000, the had about 400 student.

Presently [2024], the school has grown to about 1,300 students with a teaching staff of 54 teachers and 40 Non teaching. The School is currently headed by Mrs Sowobi Mary Mwanja, Ms.Nampeera Catherine as deputy, Mr. Byaruhanga John Paul as Director of Studies.

Because of the big growing number of students, a total of 4 new storyed structures were put up. 1 storyed structure to cater for boys’ dormitory and another fort girls’ dormitories. The 3rd storyed structure for classroom usage, large computer laboratory and tailoring activities. The 4th multi – stroyed complex was also erected with the ground floor being Home Economics lab, and the school sick bay. The 1st floor consists of Science labs [Physics, Biology and Chemistry] and 2nd floor consists of the school Library which seats a capacity of over 400 students at ago.