Alvaiázere (Portuguese pronunciation: [aɫvɐˈjazɨɾɨ]) is a municipality in the district of Leiria in Portugal. The population in 2011 was 7,287, in an area of 160.48 km².

The municipality is bordered by the municipalities of Ansião (to the north), Figueiró dos Vinhos (to the northeast and east), Ferreira do Zêzere (to the southeast), Ourém (to the southwest) and Pombal (to the west). The present Mayor is Paulo Delgado Morgado, elected by the Social Democratic Party. The municipal holiday is on June 13.