Alagoa may refer to:
People
- E. J. Alagoa. Nigerian historian
Places
Brazil:
- Alagoas, a northeastern state
- Alagoa, Minas Gerais
- Alagoa Grande, Paraíba
- Alagoa Nova, Paraíba
- Conceição das Alagoas, Minas Gerais
- Estrela de Alagoas, Alagoas
Portugal:
- Alagoa, Portalegre