| Great Lakes Secondary School | |
| Streetaddress: | 340 Murphy Road |
| Province: | Ontario |
| County: | Lambton County |
| Country: | CAN |
| Schoolboard: | Lambton Kent District School Board (LKDSB) |
| Principal: | Derek Stenton |
| Staff: | 95 |
| Schooltype: | Secondary School |
| Enrolment: | Approximately 1000 students[1] |
| Grades: | 9-12, Optional 13th Grade |
| Age Range: | 13-18 |
| Medium: | English, French, and Ojibwe |
| Athletics: | Basketball, Baseball, Badminton, Golf, Tennis, Rugby, Soccer, Cross Country, Track and Field, Volleyball, Football |
| Team Name: | Great Lakes Wolfpack |
| Nickname: | GLSS |
| School Colours: | light blue, silver, black[2] |
| Status: | Functioning |
| Communities: | Sarnia, Point Edward, Corunna |
| Feeders: | Lansdowne, Confederation Central, High Park, Colonel Cameron, P.E. McGibbon, London Road, Sir John Moore |
Great Lakes Secondary School (GLSS) is a high school in Sarnia, Ontario. It was previously named St. Clair Secondary School, and it was renamed after being consolidated with Sarnia Collegiate Institute and Technical School. It is managed by the Lambton Kent District School Board.[3]
Great Lakes Secondary School has teams that are competitive at the board, regional, provincial, and national level. Teams include:(1)