Encyclopedias, Almanacs, Transcripts, and Maps
- Portolá, Gaspar De (c. 1717–1786)
- Portugal, Marcos Antônio da Fonseca (1762–1830)
- Portugal, Restoration of 1640
- Portuguese Empire
- Portuguese in Latin America
- Portuguese Language
- Portuguese Language and Literature
- Portuguese Overseas Administration
- Portuguese Trade and International Relations
- Posada, José Guadalupe (1852–1913)
- Posadas Ocampo, Juan Jesús (1926–1993)
- Posadas, Gervasio Antonio de (1757–1833)
- Posidonius (135–51? BCE)
- Positivist Church of Brazil
- Posner, Richard (1939–)
- Possibility
- Post, Frans Jansz (1612–1680)
- POST-CREOLE CONTINUUM
- Postage Stamps
- Postglacial Environmental Transformation