is a public high school located in Durham, Connecticut and is named after the Coginchaug River.

It is part of Regional School District #13, which encompasses the communities of Durham, Middlefield and Rockfall, Connecticut.

A variety of academic programs and coursework are offered at Coginchaug, including special education, standard high school classes at three levels (Honors, College Prep A, and College Prep B), and Advanced Placement classes.

Coginchaug offers a wide range of sports and extracurricular activities, including; cross country, indoor and outdoor track, basketball, soccer, football (co-op with East Hampton and Hale-Ray), volleyball, golf, tennis, baseball, softball, ice hockey (boys co-op with Haddam-Killingworth Regional and Lyman Hall in Wallingford; plays home games at Northford Ice Pavilion), swimming and diving (co-op with Lyman Hall, meets held at Sheehan HS in Wallingford), and also offers a Unified Sports program The school's mascot is the Blue Devil, and the school's colors are blue and white.

[3] The boys' outdoor track team has a very decorated record, which includes Shoreline Championships in 1995-2002, 2007, 2010, 2017, and 2018.