The Royal Grammar School High Wycombe (or RGS for short) is a selective grammar school situated in High Wycombe, Buckinghamshire that achieved Academy status in February 2011. As a state school it does not charge fees for students to attend, but they must pass an entrance exam (The 11+).

RGS' facilities are above average and the Oxbridge entry is exceptional. For the last twenty years the school has produced top class exam results, both at GCSE and A-level, surpassing many of its fee-paying competitors.

Established by Royal Charter in 1562 (though originally established as a school in 1550), it is situated on Amersham Hill to the north of the town and has a capacity of about 1450 boys aged between 11 and 18.

The school also has boarding facilities.