GAPAN, a municipality (with 8 barrios or districts) of the province of Nueva Ecija, Luzon, Philippine Islands, almost directly south of Cabanatuan, the capital. Pop. (1918) 13,617. It is situated in a rich rice-growing region, and extensive forests in the vicinity contain fine hardwoods. It is one of the chief commercial municipalities of the province. In 1918 it had three rice mills with an output valued at 1,888,400 pesos. Its six schools were all public. Tagalog and Pampanga are the chief languages spoken.