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Canada, Calgary
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Strathcona-Tweedsmuir School opened in fall 1971 as a coordinate school following major donations. One year later it became a coeducational day school for Grades 1–12. The outdoor education program and the social agencies program began in the 1970s, creating a family‑like environment. Advanced Placement courses were introduced and campus expansions added the Science Wing, the Arts Wing, the Sandy Heard Sports Hall, and the Outdoor Education Centre. The motto Nil Nisi Optimum began to be interpreted as “Nothing but your best,” and Head of School leadership included Mrs. Grant‑Watt's appointment in August 2018.
STS has a vibrant community with an active Alumni Association and events listed under News & Events. The Alumni Association hosts events such as the Alumni Celebration Dinner (the 16th annual on May 7, 2026), Homecoming, Fall Fair, and Open House, and offers programs including Notable Alumni, Alumni Connection, and Celebrating Alumni Series. The site also highlights ongoing community activities and upcoming events for the STS family.
The school has a Parents' Volunteer Association. The Parents' Volunteer Association was formalized and instrumental in support of all STS activities.
Strathcona-Tweedsmuir School is an independent co-educational K–12 day school in Canada offering an IB continuum from the Primary Years Programme to the Diploma Programme. The PYP operates Kindergarten to Grade 6 within the Alberta Education framework to foster global perspectives. The MYP (Grades 7–10) covers eight subject areas and requires study in at least two languages, while Grades 11–12 may pursue the IB Diploma Programme or the IB Certificate pathway, including an Extended Essay. The school sits on a 220-acre natural campus with wetlands, forests, grasslands and an observatory. Facilities include a 65,000-square-foot arts and learning expansion opened in 2018, a 630-seat C.A. Smith Arts Centre, dedicated arts studios, the Peter B. Ditchburn Library with over 37,000 books, and Aspen Lodge and Band Room. Outdoor Education is a flagship program; the rugby program is highly regarded; and Round Square and the Duke of Edinburgh's International Award provide global leadership opportunities.
