| North Middlesex District High School | |
| Address: | 100 Main Street |
| City: | Parkhill |
| Province: | Ontario |
| Postcode: | N0M 2K0 |
| Country: | Canada |
| Coordinates: | 43.1541°N -81.6855°W |
| Schooltype: | Secondary |
| Motto: | Knowledge Conquers All |
| Schoolboard: | Thames Valley District School Board |
| Superintendent: | Karen Wilkinson |
| Principal: | A Smith |
| Grades Label: | Grades |
| Grades: | 9 to 12 |
| Enrollment: | 147[1] |
| Enrollment As Of: | November 2018 |
| Language: | English |
| Area: | North Middlesex |
| Colours: | Wine and White |
| Mascot: | Marauder |
| Team Name: | NMDHS Marauder |
North Middlesex District High School is on Main Street, Parkhill, Ontario, Canada, at the corner of Elginfield Road and Parkhill Main Street (Formerly Highways 7 and 81), and serves the largely farming Municipality of North Middlesex. It offers a co-operative education program. It is the home of the "Marauders". It is the smallest high school in the Thames Valley District School Board.