Douglas Brent Hegdahl is a former United States Navy petty officer second class (E-5) who was held as a prisoner of war during the Vietnam War. After an early release, he was able to provide the names and personal information of about 256 fellow POWs, as well as reveal the conditions of the prisoner-of-war camp.

Members of the United States armed forces were held as prisoners of war (POWs) in significant numbers during the Vietnam War from 1964 to 1973. Unlike U.S. service members captured in World War II and the Korean War, who were mostly enlisted troops, the overwhelming majority of Vietnam-era POWs were officers, most of them Navy, Air Force, and Marine Corps airmen; a relatively small number of Army enlisted personnel were also captured, as well as one enlisted Navy seaman, Petty Officer Doug Hegdahl, who fell overboard from a naval vessel. Most U.S. prisoners were captured and held in North Vietnam by the People's Army of Vietnam (PAVN); a much smaller number were captured in the south and held by the Việt Cộng (VC). A handful of U.S. civilians were also held captive during the war.