St Leonards School is a co-educational private boarding and day school for pupils aged 4–19 in St Andrews, Fife, Scotland. Founded in 1877 as St Andrews School for Girls Company, it adopted the St Leonards name upon moving to its current premises, the site formerly occupied by the University of St Andrews’ St Leonard's College, in 1883.
The school emerged from the St Andrews Ladies' Educational Association which was established in 1868. One of the school's founders was Lewis Campbell, chairman of the college council for many years and a Classics professor at St Andrews University who advocated for higher education for women. Consequently, from its earliest days, the college's senior students were encouraged to prepare to matriculate and enjoyed close links with various courses offered at the University of St Andrews; in 1892, the Fifeshire Journal asked its readers: "Who is to enjoy the proud distinction of being the first matriculated girl-student of St Andrews?" St Leonards remained an all-girls school until 1999, upon which it became fully co-educational. As an IB World School, St Leonards offers the International Baccalaureate's Primary Years, Middle Years, Career-related and Diploma programmes alongside the English-system GCSE/IGCSE. It is one of only two schools in Scotland to teach an IB curriculum throughout.