| Northwestern Jr./Sr. High School | |
| Streetaddress: | 5780 Troy Road |
| City: | Springfield |
| State: | Ohio |
| County: | Clark County |
| Zipcode: | 45502 |
| Country: | USA |
| Coordinates: | 39.9917°N -83.9097°W |
| Superintendent: | Jesse Steiner |
| Principal: | Rebecca Kleinhenz |
| Viceprincipal: | Matt Bushey |
| Type: | Public high school |
| Grades: | 9-12 |
| Conference: | Central Buckeye Conference |
| Slogan: | "Valuing one another, working with one another, succeeding together." |
| Team Name: | Warriors[1] |
| Colors: | Red Blue |
| Homepage: | northwestern.k12.oh.us |
Northwestern High School is a public high school near Springfield, Ohio. It is the only high school in the Northwestern Local Schools district.
The school itself is a 1948 consolidation of North Hampton and Lawrenceville high schools, deriving its name from the northwest portion of Clark County. Accordingly, the school serves the residents of North Hampton and Lawrenceville as well as the villages of Tremont City, Dialton and Upper Fox Hollow, and adjacent rural areas in Pike and German Townships.
The district opened two new school buildings, an elementary and a high school, in the fall of 2013. All remaining buildings were demolished, and the middle school ceased to exist. In 2018, the district has opened a new Athletic Complex near its stadium.
* won by Lawrenceville High School prior to consolidation into Northwestern