Fonte Boa (literally, "good water spring") is a municipality located in the Brazilian state of Amazonas. Its population was 17,005 (2020) and its area is 12,111 km<sup>2</sup>.
The city is served by Fonte Boa Airport.
One of the city's best-known attractions is the Pirarucu Festival, which celebrates the annual fishing of the fish.
The municipality contains 45% of the AuatÃÂ-Paraná Extractive Reserve, created in 2001.