Thames Valley Grammar School was a co-educational grammar school in Twickenham, London Borough of Richmond upon Thames, England.

Thames Valley Grammar School was opened in 1928 under one of the youngest headmasters in the country, Mr Harold Willoughby Bligh (1895 to 1969).

Initially conceived as a boys school, unusually for the time it opened, and remained, as a co-educational establishment.

[1] Its final secondary intake was in 1972 and from 1973 it gradually changed into a sixth-form college; Thames Valley Sixth Form College.

This London school or sixth form college related article is a stub.