Mosteiros is a civil parish in the municipality of Ponta Delgada on the Portuguese island of São Miguel in the Azores. The population in 2011 was 1,123, in an area of 8.95 square kilometres (3.46 sq mi). It contains the localities Chã das Machadas, Lomba dos Homens, Lombinha and Mosteiros.

Ponta Delgada is the largest municipality (concelho) and executive capital of the Autonomous Region of the Azores in Portugal. It is located on São Miguel Island, the largest and most populous in the archipelago. As of 2021, it has 67,287 inhabitants, in an area of 232.99 square kilometres. There are 17,629 residents in the three central civil parishes that comprise the historical city: São Pedro, São Sebastião, and São José. Ponta Delgada became the region's administrative capital under the revised constitution of 1976; the judiciary and Catholic See remained in the historical capital of Angra do Heroísmo while the Legislative Assembly of the Azores was established in Horta.