The Philippine Navy (PN) (Filipino: Hukbong Dagat ng Pilipinas, lit. 'Army of [the] Sea of [the] Philippines') is the naval warfare service branch of the Armed Forces of the Philippines. It has an estimated strength of 24,500 active service personnel, including the 10,300-strong Philippine Marine Corps. It operates 92 combat vessels, 16 auxiliary vessels, 27 manned aircraft and 8 unmanned aerial vehicles. Tracing its roots from the Philippine Revolutionary Navy on May 20, 1898, while its modern foundations were created during the creation of the Offshore Patrol on February 9, 1939, the PN is currently responsible for naval warfare operations and maritime patrol missions within the Philippine Waters, as well as ensuring the protection of the Philippine's maritime interests, including the West Philippine Sea and Benham Rise.

It shares the responsibility of patrolling the maritime borders with the Philippine Coast Guard, a formerly attached unit which became a separate maritime law enforcement agency in 1998. The PN is also responsible for anti-piracy missions on the Sulu Sea also deploys naval assets during humanitarian assistance operations in the aftermath of disasters. The PN's headquarters is located in Naval Station Jose Andrada in Manila, and is currently led by the Flag Officer-in-Command of the Philippine Navy, who holds the rank of Vice Admiral.

It has two type Commands under it, namely the Philippine Fleet and the Philippine Marine Corps. The Philippine Fleet is responsible in its naval platforms while the Philippine Marine Corps provides it with amphibious forces.

Before the Spaniards arrived in the Philippines the ancient native people were already engaging in naval warfare, raiding, trade, piracy, travel and communication using various vessels including balangay. A flotilla of balangay was discovered in the late 1970s in Butuan, Agusan del Norte.

Native Visayan warships, such as the Karakoa or Korkoa, were of excellent quality and some of them were used by the Spaniards in expeditions against rebellious tribes and Dutch and British forces. Some of the larger rowed vessels held up to a hundred rowers on each side besides a contingent of armed troops. Generally, the larger vessels held at least one lantaka at the front of the vessel or another one placed at the stern. Philippine sailing ships called praos had double sails that seemed to rise well over a hundred feet from the surface of the water. Despite their large size, these ships had double outriggers. Some of the larger sailing ships, however, did not have outriggers.

Antecedent to these raids, sometime between A.D. 1174 and 1190, a traveling Chinese government bureaucrat Chau Ju-Kua reported that a certain group of "ferocious raiders of China's Fukien coast" which he called the "Pi-sho-ye," believed to have lived on the southern part of Formosa. In A.D. 1273, another work written by Ma Tuan Lin, which came to the knowledge of non-Chinese readers through a translation made by the Marquis D’Hervey de Saint-Denys, gave reference to the Pi-sho-ye raiders, thought to have originated from the southern portion of Formosa. However, the author observed that these readers spoke a different language and had an entirely different appearance (presumably when compared to the inhabitants of Formosa).

In the Battle of Manila in 1365 is an unspecified and disputed battle occurring somewhere in the vicinity of Manila between the forces of the Kingdoms in Luzon and the Empire of Majapahit.^{[citation needed]}

Even though the exact dates and details of this battle remain in dispute, there are claims of the conquest of the area around Saludong (Majapahit term^{[citation needed]} for Luzon and Manila) according to the text Nagarakretagama