The Loomis Chaffee School (/ˈluːmɪs ˈtʃeɪfi/; LC or Loomis) is an independent, coeducational, college preparatory school for boarding and day students in grades 9–12, including postgraduate students, located in Windsor, Connecticut, seven miles north of Hartford.

In addition to being tuition-free, The Loomis Institute was distinguished from other New England preparatory schools by its lack of religious affiliation, offering of vocational education alongside college preparatory courses, and admission of both boys and girls.

[10] The Loomis Institute ended coeducation in 1926 when The Chaffee School was incorporated to educate girls on an adjacent campus.

[10] Since then, the school has expanded as its endowment, financial aid budget, faculty, and campus increased in size.

Additionally, Loomis is a member of The Founders League which comprises private schools located mainly in Connecticut.