General Mamerto Natividad, officially the Municipality of General Mamerto Natividad, also known as Gen. M. Natividad, is a municipality in the province of Nueva Ecija, Philippines. According to the 2024 census, it has a population of 43,779 people. It is named in honor of Filipino military leader Mamerto Natividad, who led battles against Spanish colonizers in Nueva Ecija during the Philippine Revolution.