Bristol Grammar School (BGS) is a 4–18 mixed, private day school in Bristol, England. It was founded in 1532 by Royal Charter for the teaching of 'good manners and literature', endowed by wealthy Bristol merchants Robert and Nicholas Thorne who made their money through the work and trade of enslaved Africans. The school flourished in the early 20th century under headmaster Sir Cyril Norwood (1906–1916), embodying "the ideals and experiences of a leading public school". Norwood went on to serve as the master at Marlborough College and Harrow, and as president of St John's College, Oxford.

Sir Cyril M. Norwood was an English educationalist who served as Headmaster of Bristol Grammar School and Harrow School, Master of Marlborough College, and President of St John's College, Oxford.