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| Tallinn School No. 21 Tallinna 21. Kool | |
|---|---|
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.jpg) The main building of the Tallinn School No. 21 | |
| Address | |
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Raua 6 , | |
| Coordinates | 59°26′07″N 24°45′59″E / 59.4354°N 24.7664°E |
| Information | |
| Type | Public |
| Established | 1903 |
| Principal | Meelis Kond |
| Grades | 1–12 |
| Number of pupils | 1385 |
| Website | Official website  |
Tallinn School No. 21 is a secondary school in Tallinn, Estonia. The school was founded as the Tallinn kroonualgkool No. 21. The first schoolhouse was a wooden house on J. Poska 6a. In 1923–1924 as the number of students grew, a new schoolhouse was needed.
The school is a member of the G5 Union of Schools which comprises what some call the "elite Tallinn city centre schools": Tallinn English College, Tallinn French School, Gustav Adolf Grammar School, Tallinn School No. 21.