The Chief of Staff of the Armed Forces of the Philippines (CSAFP) is the highest-ranking military officer (except for the President of the Philippines, who holds the position of Commander-in-Chief equivalent to a five-star general) and the head of the Armed Forces of the Philippines (AFP), including all service branches (Army, Air Force, Navy–Marine Corps) under its command. The position is usually held by a four-star rank of General or Admiral. Its direct equivalent in the US Armed Forces is the Chairman of the Joint Chiefs of Staff. Unlike its US counterpart, which is merely supervisory, the Chief of Staff has complete operational control within the military hierarchy and is responsible for the overall operations of the AFP.

The holder of this position is appointed by, as well as directly reports to the President of the Philippines under the Article VII, Section 18 of the 1987 Constitution.^[2] He executes the President's commands, tactics, operations, plannings, and strategies, as well as serves as the Immediate Adviser to the Secretary of National Defense. He also prescribes directions to all commands (including the Commanding General of the Philippine Army, the Commanding General of the Philippine Air Force, the Flag Officer-in-Command of the Philippine Navy, the Commanders of the AFP Unified Commands, and the AFP Board of Generals).

The Armed Forces of the Philippines were created as a result of the Commonwealth Act No. 1, also known as the National Defense Act of 1935. However, the origin of the organization can be traced back to the establishment of the Philippine Constabulary, armed Filipino forces organized in 1901 by the United States to combat the Philippine Revolutionary Army then led by General Emilio Aguinaldo.

The position of the Chief of Staff has been traced from the Commanding General of the Philippine Army, when the Philippine Commonwealth Army (now the Philippine Army) was established as the main army of the Commonwealth of the Philippines. After the defeat of the First Philippine Republic during the Philippine–American War, the United States dissolved the army and relied on its armed forces together with some Filipino troops under the Philippine Constabulary. However, the National Defense Act of 1935 led to take on responsibilities on national defense and pave way for the creation of three major commands (Army, Air Force, Navy). Since the 1960s, the rosters of the Chiefs of Staff is arranged accordingly.^[3]

On June 19, 2020, under the DND Order no. 174, the title of Chief of Staff was renamed as the Chairman of the Joint Chiefs, while the Vice-Chief of Staff as vice-chairman of the Joint Chiefs, and The Deputy Chief of Staff as Chief of the Joint Staff.^[4] Although the usage of these titles were deferred.^{[5][citation needed]}

The AFP Chief of Staff is assisted by the Vice-Chief of Staff of the AFP (VCSAFP) and The Deputy Chief of Staff of the AFP (TDCSAFP), both holders of the rank of Lieutenant General/Vice Admiral. The Vice-Chief of Staff serves as the primary assistant of the AFP Chief of Staff in their operational duties, as well as in policy conceptualization and implementation matters in the AFP, and also assists the AFP Chief of Staff in their absence. The Deputy Chief of Staff (TDCS) is tasked to supervise the organizational staff, including the Joint Staff, the Special Staff, the Administrative and the Technical Staff. The Deputy Chief of Staff is also responsible for assisting the AFP's overall policy and strategy formations, and perform other duties assigned by the AFP Chief of Staff. These posts are also assisted by the Secretary Joint Staff (SJS), who serves as the executive officer for the AFP Chief of Staff, the Vice-Chief of Staff, and The Deputy Chief of Staff.^[6] The AFP Chief of Staff is also advised on enlisted personnel matters by the Armed Forces of the Philippines Sergeant Major (AFPSM).

The AFP Chief of Staff has no definite or fixed term limit, under Republic Act No. 8186,^[7][8] as the term limit of the AFP Chief of Staff, along with all uniformed members of the AFP, has a mandatory retirement age at 56 years old. Nevertheless, the AFP Chief of Staff's term can be extended and allows a flexible term while serving beyond the mandatory retirement age, as the AFP Chief of Staff can serve their post until 3 years. Plans to reform the current system were made in 2011, but was vetoed by then-President Benigno Aquino III. An updated bill is currently being crafted since 2020, which aims to create a fixed term of 3 years for the AFP Chief of Staff, the Vice-Chief of Staff, The Deputy Chief of Staff, the commanders of the three major services (Army, Navy, Air Force), the commanders of the unified commands (NOLCOM, SOLCOM, WESCOM, CENTCOM, WESTMINCOM, EASTMINCOM), the commandant of the Philippine Marine Corps, the commander of the AFP Special Operations Command, and the commander of the upcoming Cyber Security Command; while the Superintendent of the Philippine Military Academy (PMA) will have a 4-year term in their post, and will not be allowed to be reappointed in other higher posts. The bill also allows the president to remove the sitting AFP chief of staff at his/her pleasure within their 3-year term. Once passed and enacted into law, the new law aims to increase the flexibility, organizational professionalism and effectiveness in their respective roles.^[9][10] On May 16, 2022, former President Rodrigo Duterte signed the Republic Act No. 11709, which serves as the new law that enables a three-year fixed term for key officials of the Armed Forces of the Philippines, including the Chief of Staff of the AFP.^[11]

Months after the signing of the new term law, reports were being made on the possible rumbling in the AFP Hierarchy due to the complications caused by the Republic Act No. 11709 from the promotions of younger officers and to the reduction of promoted officers within the senior officers rank (Major-Colonel/Lieutenant Commander-Captain) due to the reduced tenure limits, which caused anxiety regarding the lowering of a merit-based promotion system.^[12] The issue also got more friction from an editorial article written by former AFP spokesman Major General Edgard Arevalo PN(M) (Ret.) in The Manila Times named "The fates of two AFP chiefs of staff", which tackles about the appointment of Lieutenant General Bartolome Vicente Bacarro as AFP Chief, who is retiring earlier than his predecessor General Andres Centino, which makes Centino's position more higher than Bacarro's. ^[13][14][15] Due to these problems, a revised law was crafted to solve the problems, which led to the ratification of Republic Act no. 11939, which was signed by President Bongbong Marcos on May 17, 2023. ^[1] Under the new law, the reduced number of officials who will have a fixed term to only five, namely the Chief of Staff of the Armed Forces of the Philippines (three-year tenure); the Commanding General of the Philippine Army, the Commanding General of the Philippine Air Force, the Flag Officer-in-Command of the Philippine Navy (two-year tenure) and the Superintendent of the Philippine Military Academy (four-year tenure).^[1] The law also allows their fixed terms to be completely terminated upon the President's pleasure. Amidst the swirling rumors on the potential replacement of the AFP chief regarding the seniority problem, the issues within the top brass was resolved on January 7, 2023, as General Andres Centino was reappointed as the AFP Chief replacing Lieutenant General Bartolome Vicente Bacarro.^[16]

• Chairman of the Joint Chiefs of Staff (Jordan)
• Chairman Joint Chiefs of Staff Committee (Pakistan)
• Chairman of the Joint Chiefs of Staff (United States)