- Arms: Azure, a lion rampant, in dexter chief two arrows in saltire, points downward, tied in the centre with a bow and enfiled with a wreath of laurel, all argent.
- Motto: (Below shield) Donorum Dei dispensatio fidelis; (above shield and badge) Stet fortuna domus.
- Badge: Two arrows in saltire, points downward, tied in the centre with a bow and enfiled with a wreath of laurel, all argent.
The arms were officially granted on October 3, 1929 to The Keepers and Governors of the possessions, revenues and goods of the Free Grammar School of John Lyon within the Town of Harrow on the Hill in the County of Middlesex.
We have no information on the meaning or origin of these arms.
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The arms as used on a JaJa postcard +/- 1905