| Sir Alexander Mackenzie Secondary | |
| Address: | Bag 800 |
| City: | Hagensborg |
| Province: | British Columbia |
| Postcode: | V0T 1H0 |
| Country: | Canada |
| Coordinates: | 52.3888°N -126.54°W |
| Schooltype: | high school |
| Fundingtype: | Public |
| Founded: | October 30, 1949 |
| Schoolboard: | School District 49 Central Coast |
| Number: | 4949002 |
| Principal: | Scott Jonathan Barnes |
| Staff: | 24 |
| Grades Label: | Grades |
| Grades: | 8-12 |
| Enrollment: | 86 |
| Enrollment As Of: | September 30, 2019 |
| Colours: | Royal Blue |
| Mascot: | Grizzly Bear |
| Team Name: | Grizzlies |
Sir Alexander Mackenzie Secondary is a public high school in Hagensborg, British Columbia part of School District 49 Central Coast. It was named after the Scottish-Canadian explorer Sir Alexander MacKenzie, who was the first European to reach the Pacific Ocean overland.