Marlborough College is an independent boarding and day school in Marlborough, Wiltshire, England. Founded in 1843 for the sons of Church of England clergy, it is now co-educational. For the academic year 2015/16, Marlborough charged £9,610 per term for day pupils, making it the most expensive day school in the Headmasters' and Headmistresses' Conference (HMC) – the association of British independent schools.[1] Fees for full boarders are up to £11,310 per term, the 28th most expensive HMC boarding school.

The Good Schools Guide described Marlborough as a "famous, designer label, co-ed boarding school still riding high. The school is a member of the G20 Schools Group. A sister school in Johore, Malaysia opened in 2012.