| Leone Preparatory School | |
| City: | Freetown |
| Country: | Sierra Leone |
| Schooltype: | Independent Co-educational Primary Preparatory school |
| Principal: | Bertha Conton |
| Campus: | King Harman Road, Freetown, Sierra Leone |
| Campus Size: | 300–400 students |
| Founder: | Bertha Yvonne Conton |
| Director: | Dr Brian Conton |
| Established: | 1961 |
The Leone Preparatory School, also known as Bertha Conton or The Bertha Conton School, is an independent co-educational primary preparatory school based in Freetown, Sierra Leone founded by Bertha Yvonne Conton, a Sierra Leonean educator, principal, and school proprietress. The school was established in Bo, Sierra Leone in 1961 and was subsequently transferred to Freetown, Sierra Leone. The school is consistently ranked as one of the premier educational institutions in Sierra Leone.
The school was informally established in Bo, Sierra Leone in 1961 when Bertha Conton started giving lessons to children on the veranda of her home. The school later transferred operations to Freetown, Sierra Leone and was formally established in 1963.
The school had the record for the highest marks ever achieved at the National Primary School Exams in a year that saw its pupils placing first, second and third in the country. The institution still consistently places one to two pupils in the first ten in the country at the national exam. Furthermore, the school still has the record for the highest marks ever achieved at the National Primary School Exams in a year that saw its pupils placing first, second and third in the country.
The school developed and uses an ultra-modern school curriculum that incorporates elements of the child-centered Montessori method of education or the Montessori philosophy for early year students in addition to computer based instruction, with a variable based learning style methodology geared towards self-directed scholarship by students.
By 1992, Bertha Conton privately financed and built the current campus at King Harman Road with a computer lab and an assembly hall. The current campus is a modern facility designed for up to 400 pupils.