Killingly High School

Killingly High School is a public high school in Killingly, Connecticut. The school reported 792 students and 65 FTE classroom teachers for the 2014–2015 school year. Killingly High is the only public high school in the Killingly School District, which is on the eastern edge of Windham County. It also serves the nearby town of Brooklyn.

For 2015, the community voted to make the school the sole polling place in Killingly. The Secretary of State informed the town registrar's office that this was a misinterpretation of statute, and in 2016, a second polling place was opened at the school's old location.

Sports at the school are done as part of the Eastern Connecticut Conference.

Killingly High was included in a segment of the reality TV series The Principal's Office in 2009.

Old Killingly High School was built in 1908 and used by the school until 1965. The second building was then used until 2010 and continues to act as the site of an alternative learning program and the school district's central office. The first building was listed on the National Register of Historic Places in 1992 and is now the town's community center.