| Garrison Tower | |
| Coordinates: | 49.9125°N -6.3224°W |
| Location: | St Mary's, Isles of Scilly, England |
| Designation1: | Grade II |
| Designation1 Offname: | Garrison Tower |
| Designation1 Date: | 14 December 1992 |
Garrison Tower is a Grade II listed structure on St Mary's, Isles of Scilly
The tower was built in the 17th century as a windmill. By 1750 it was abandoned and in a ruined condition. The remains were converted to a lookout tower in the 1830s by HM Coastguard.
In 1869, the Shipping and Mercantile Gazette obtained it as a lookout post to report shipping movements. It was taken over by Lloyd's of London in 1871.[1]