The Mosteiros Islets (Portuguese: Ilhéus dos Mosteiros; literally, Islets of the Monasteries) are four uninhabited rocky islets located about 0.5 nautical miles (0.93 km; 0.58 mi) from the settlement of Mosteiros, off the extreme northwestern coast of the island of São Miguel in the Portuguese archipelago of the Azores.

According to Azorean chronicler Gaspar Frutuoso, the earliest settlers to the area thought the largest of the islets looked like a church or monastery, and therefore named the islets and their settlement Mosteiros.

[1] Frutuoso noted: The Mosteiros Islets are the exposed remains of a submarine volcanic cone heavily eroded by the sea over time.

The maximum altitude of the islets is 72 metres (236 ft) above sea level.

Their picturesque quality makes them a sought-out tourist destination in the Ponta Delgada region.