The Hotchkiss School is a private college-preparatory day and boarding school in Lakeville, Connecticut. It educates approximately 600 students in grades 9–12, plus postgraduates. Founded in 1891, it was one of the first English-style boarding schools in the United States and an early proponent of student financial aid, having accepted scholarship students since its inception.

Hotchkiss is a member of the Eight Schools Association and Ten Schools Admission Organization, two groups of American boarding schools. It was also a founding member of the G20 Schools group, an international association of college-preparatory high schools.

The school's list of notable alumni includes Supreme Court justice Potter Stewart, Nobel laureate Dickinson Richards, Morgan Stanley co-founder Harold Stanley, and Yale University president A. Whitney Griswold.