The Peruvian Navy (Spanish: Marina de Guerra del Perú, abbreviated MGP, literally "Peruvian War Navy") is the branch of the Peruvian Armed Forces tasked with surveillance, patrol and defense on lakes, rivers and the Pacific Ocean up to 200 nautical miles (370 km; 230 mi) from the Peruvian littoral. Additional missions include assistance in safeguarding internal security, conducting disaster relief operations and participating in international peacekeeping operations.

The Marina de Guerra del Perú celebrates the anniversary of its creation in 1821 on October 8 and also commemorates the decisive Battle of Angamos, the final part of the naval campaign of the War of the Pacific between Peru and Chile at the end of 1879. The Marina de Guerra del Perú was established on 8 October 1821 by the government of general José de San Martín. Its first actions were undertaken during the War of Independence (1821–1824) using captured Spanish warships. The Peruvian Naval Infantry was also formed during the war with Spain, performing successfully in their first battle where they seized Arica from the Spanish. Following the War of the Pacific, the Peruvian Navy had to be completely rebuilt. In 1900 the force consisted of only one cruiser of 1,700 tons displacement, a screw-driven steamer, and ten smaller ships – the latter described by a contemporary British publication as "of no real value".  During the Presidency of Augusto B. Leguía (1919–1930) a Navy Ministry was established as well as a Navy Aviation Corps, both in 1920.

Naval Forces are subordinated to the Ministry of Defense and ultimately to the President as Commander-in-Chief of the Peruvian Armed Forces. They are organized as follows:

• Comandancia General de la Marina (Navy General Command)

  • Estado Mayor General de la Marina (Navy General Staff)

  • Inspectoría General de la Marina (Navy General Inspectorate)

Operational units are divided between three commands:

Comandancia General de Operaciones del Pacífico

Pacific Operations General Command, it comprises the following units:

• Fuerza de Superficie (Surface Force)

• Fuerza de Submarinos (Submarine Force)

• Fuerza de Aviación Naval (Naval Aviation Force)

• Fuerza de Infantería de Marina (Naval Infantry Force)

• Fuerza de Operaciones Especiales (Special Operations Force)

Comandancia General de Operaciones de la Amazonía

Amazon Operations General Command, tasked with river patrolling in the Peruvian portion of the Amazon Basin.

Dirección General de Capitanías y Guardacostas

Directive General of Captains and Coast Guard, oversees Coast Guard operations.

Coast Guard, tasked with law enforcement on Peruvian territorial waters, rivers and lakes. The Peruvian Coast Guard often performs anti-drug trafficking operations within the nation's waters.

The Naval Aviation Force (in Spanish): (Fuerza de Aviación Naval, AVINAV) is the air branch of the Peruvian Navy, its roles include anti-submarine warfare, anti-surface warfare, maritime surveillance, reconnaissance and transport of marine personnel. It is also responsible for airborne operations of the Peruvian Marines.

The 3,000 personnel Peruvian Naval Infantry (Spanish: Infantería de Marina del Perú - IMAP) includes an amphibious brigade of three battalions and local security units with two transport ships (one used as a training ship), four tank landing ships, and about forty Portuguese Chaimite armored personnel carriers.