| Cartwright High School | |
| Address: | 14 220 Old Scugog Road |
| City: | Blackstock |
| Province: | Ontario |
| Postcode: | L0B 1B0 |
| Country: | Canada |
| Schooltype: | Public |
| Founded: | 1924 |
| Closed: | 2013 |
| Schoolboard: | Durham District School Board |
| Grades Label: | Grades |
| Grades: | 9-12 |
| Enrolment: | 115 (2012) |
| Language: | English |
Cartwright High School was located in Blackstock, Ontario within the Durham District School Board. The school had approximately 115 students in grades 9–12. The school closed in June 2013.