Millfield is a private school with boarding and day school facilities for pupils aged 13–18 located in Street, Somerset, England. It was founded in 1935.
Millfield is a registered charity and is the largest co-educational boarding school in the UK with about 1,330 students, of whom over 990 are full boarders from 75 countries. Millfield Development and the Millfield Foundation raise money to fund scholarships and bursaries. The school is a member of the G20 Schools Group and a member of the Headmasters' and Headmistresses' Conference. The Millfield campus is based over 240 acres in Somerset, in and around Street, in the South West of England.