Aliaga is a second class municipality in the province of Nueva Ecija, Philippines, Formerly it was called Pulung Bibit and Maynilang Munti (Little Manila). The First mayor is Aneceto Pere. According to the 2010 census, it has a population of 57,805 people.
It has a comparatively cool and healthful climate, and is pleasantly situated about midway between the Pampanga Grande and the Pampanga Chico rivers, and in a large and fertile valley of which the principal products are mostly agricultural such as rice, tomato, eggplant, squash.
Tagalog and Ilocano are the most important and the major languages of the municipality.