Northwood High School is a public high school in Kemp Mill, Maryland, United States, with a Silver Spring postal address. It is part of the Montgomery County Public Schools system, and is one of five high schools in the Downcounty Consortium.

Northwood High School opened in 1956. In 1985, it was closed due to changing demographics in the area before reopening 19 years later, in 2004.

In 2024, the school began being rebuilt. During the rebuilding, students are attending Charles W. Woodward High School in Rockville, Maryland.