Paialvo is a Portuguese parish located in the municipality of Tomar. It has a population of 2850 inhabitants (2001) and a total area of 22.26 km².
Paialvo Parish consists of thirteen places/villages: Bexiga, Carrascal, Carrazede, Casal Barreleiro, Charneca da Peralva, Curvaceiras, Delongo, Fontaínhas, Mouchões, Paialvo, Peralva, and Soudos e Vila Nova.
In 1801 its population was 1407 inhabitants.