BRP Gregorio del Pilar (PF-15) is a frigate of the Philippine Navy and the lead ship of her class. She was the second ship of the Philippine Navy to be named after Gregorio del Pilar, a Filipino revolutionary general known for his role at the Battle of Tirad Pass.
From 1967–2011 the ship was a Hamilton-class high endurance cutter of the United States Coast Guard that was named USCGC Hamilton (WHEC-715). The U.S. decommissioned the cutter on March 28, 2011 and the Philippines acquired it under the Excess Defense Articles and the Foreign Assistance Act and is one of two ex-US Coast Guard Hamilton-class cutters to serve the Philippine Navy.