Pío del Pilar (born Pío Isidro y Castañeda; July 11, 1860 – June 21, 1931) was a revolutionary general of the Philippines. To safeguard his family and prevent them from harassment, he changed his surname to del Pilar. He was born in Barrio Culi-culi (now Pio del Pilar), San Pedro de Macati (present-day Makati) on 11 July 1860.