| 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. It has students in Grades Kindergarten to 12, with its Grade 12 provincial exam scores consistently highly ranked.[1] 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.[2] Strathcona-Tweedsmuir School place well in the annual Fraser Institute rankings. STS is also an active participant in the CESI (Canadian Educational Standards Institute) program and often volunteers teachers for inter-school evaluatory interaction. STS is also a member of Round Square and the Canadian Accredited Independent Schools (CAIS).
The school opened in September 1971 as the result of the amalgamation of two of Calgary's oldest independent schools: Strathcona School for Boys (founded in 1929) and Tweedsmuir: An Academic School for Girls (founded in 1959). St. Hilda's School (1889–1949) preceded Tweedsmuir School for Girls.[3]
In 2003, seven students from the school were killed in an avalanche in British Columbia while on a skiing trip.[4] The students were on a school ski trip on Mount Cheops near Revelstoke when the avalanche occurred. Out of the seventeen skiers involved in the avalanche, ten were rescued. Despite the incident, Strathcona Tweedsmuir School has not abandoned its outdoor education program, which is mandatory for students in grades 4–9 and optional for grade 10-12 students.[5]