Fort Santo Angel was a Spanish fortress on the island of Guam, now a United States territory.

Located on a promontory on the west coast of the island in the northernmost part the Umatac Bay in Umatac, the fort's remains are among the oldest known Spanish-era structures on the island; a fort is documented to have been standing here since 1742, and to still be in use in the early 19th century.

Perched on a monolith, there remains a plaza 40 by 24 feet (12.2 m × 7.3 m) of flagstone surrounded by a manposteria (coral mixed with cement) wall 1 foot (30 cm) high and 18 inches (46 cm) thick.

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