Chatham House Grammar School was an all boys grammar school in Ramsgate, Kent, England, that was merged in September 2011 with its sister school Clarendon House Grammar School to become the Chatham & Clarendon Grammar School. It had a coeducational sixth form and shared teaching facilities and various A Level courses with Clarendon House Grammar School. The two schools worked together to provide subjects, bands, and outings. Both schools were co-ed from the sixth form (Year 12 and 13).