Nonnewaug High School is a public school in Woodbury, Connecticut, United States, which serves the towns of Woodbury and Bethlehem, Connecticut.

The school houses the Ellis Clark Regional Agri-Science and Technology Center, which draws students from additional surrounding areas.

Nonnewaug serves approx 750 students, around a third of which are from the agriscience program.

Nonnewaug High School also contains the local television station NEAT TV available on Channel 194 for Spectrum customers in Woodbury and Bethlehem, Connecticut.

This television station airs material created by students throughout the district, as well as live television events such as basketball games and Board of Education meetings.