| Strathcona-Tweedsmuir School | |
| Motto: | Nil Nisi Optimum |
| Motto Translation: | Nothing But Our Best |
| Postcode: | T1S 1A2 |
| Country: | Canada |
| Coordinates: | 50.7751°N -114.0329°W |
| Schooltype: | Private/independent |
| Founded: | 1971 |
| Status: | Open |
| Principal: | Rory Stabler (Senior School), Jessica Richmond (Middle School), Season Prevost(Elementary School) |
| Head Of School: | Carol Grant-Watt |
| Grades: | K–12 |
| Upper Age: | 17-18 |
| Enrollment: | 726 |
| Average Class Size: | 17 |
| Schedule Type: | semestered starting 2023 - 2024 year |
| Hours In Day: | 6 hours, 35 minutes |
| Campus Size: | 220 acres |
| Area: | Foothills of the Rocky Mountains |
| Houses: | Burns, Buchan, Dover, and Howard |
| Athletics: | Cross-Country, Track & Field, Basketball, Rugby, Field Hockey, Volleyball, Badminton, Soccer |
| Mascot: | Spartacus the Spartan |
| Nickname: | Strath, STS |
| Team Name: | Spartans |
| Rivals: | Webber, Old Scona, West Island College, Oilfields |
| Accreditation: | CAIS, PYP, MYP, IB |
| Fees: | $18,020 – $25,220 (Depending on grade level) |
| Revenue: | N/A |
| Head Label: | Director of Admission |
| Language: | English |
| Campuses: | One |
| Campus: | Rural |
Strathcona-Tweedsmuir School is a private university prep school in Okotoks, Alberta, Canada, from Kindergarten to Grade 12. Strathcona-Tweedsmuir is Southern Alberta's first full IB World School, and Alberta's only independent school authorized to deliver IB Programmes in Grades K through 12.[1] The school participates in Canadian Educational Standards Institute program and is a member of Round Square and the Canadian Accredited Independent Schools (CAIS).
The school opened in September 1971 after Strathcona School for Boys and Tweedsmuir: An Academic School for Girls merged. Strathcona was founded in 1929, and Tweedsmuir in 1959, with St. Hilda's School (1889–1949) preceding the latter.[2]
In 2003, seven students from the school were killed in an avalanche in British Columbia while on a skiing trip.[3] The students were on a school ski trip on Mount Cheops near Revelstoke when the avalanche occurred.[4]