New Canaan High School is a public high school in New Canaan, Connecticut, United States.

In 2017, it was ranked the best public high school in Connecticut, and one of the top 200 in the nation. New Canaan High School was ranked the 74th best STEM high school in the nation by U.S. News & World Report.

The school is a part of the Fairfield County Interscholastic Athletic Conference, otherwise known as the FCIAC. The New Canaan Rams have won numerous state championships. New Canaan fields football, lacrosse, ice hockey, swimming, and tennis teams. Its football team holds 22 state championships and is consistently a top 10 team in the state. In 2016, its boys' lacrosse team was ranked 3rd in the nation.