Prisoner of war (POW) status is a protective legal category under international humanitarian law (IHL) granted to certain captured combatants in international armed conflicts. The governing instrument is the Third Geneva Convention of 1949 (GC III), supplemented by Additional Protocol I of 1977 for states party to it.
Article 4 of GC III enumerates who qualifies, including members of regular armed forces, militias and volunteer corps meeting four conditions (responsible command, fixed distinctive sign, carrying arms openly, and conducting operations in accordance with the laws of war), participants in a levée en masse, and certain accompanying civilians such as war correspondents. Additional Protocol I broadened eligibility to some guerrilla fighters who carry arms openly during military engagements.
Once recognized, POWs benefit from extensive protections: they may not be prosecuted for lawful acts of war, must be treated humanely (Article 13), cannot be subjected to coercive interrogation beyond providing name, rank, date of birth, and serial number (Article 17), must be evacuated from combat zones, housed in conditions comparable to the Detaining Power's own forces, and given access to the International Committee of the Red Cross (ICRC). They must be repatriated without delay after the cessation of active hostilities (Article 118).
Status is presumed when in doubt, and a competent tribunal must determine eligibility under Article 5 — a provision invoked during the Vietnam War and contested by the United States after 2001 regarding detainees at Guantánamo Bay, whom the Bush administration designated "unlawful enemy combatants." The U.S. Supreme Court in Hamdan v. Rumsfeld (2006) held that Common Article 3 of the Geneva Conventions still applied.
POW status does not apply in non-international armed conflicts (e.g., civil wars), which are governed instead by Common Article 3 and Additional Protocol II. Mercenaries, as defined in Article 47 of AP I, are explicitly denied POW status. Violations of POW protections can constitute grave breaches and war crimes prosecutable under the Rome Statute of the ICC.
Example
In 2022, both Russia and Ukraine exchanged hundreds of captured soldiers under POW protocols mediated in part by the ICRC, including a major September 2022 swap of around 200 fighters from the Azovstal steelworks.