Martin Edward Dempsey (Jersey City (New Jersey), 14 maart 1952) is een Amerikaans generaal. Hij was van 1 oktober 2011 tot 30 september 2015 de Chairman of the Joint Chiefs of Staff, de hoogste officier binnen de United States Armed Forces. In 2011 was hij de Chief of Staff of the United States Army. Van 2008 tot 2011 had hij de leiding over de United States Army Training and Doctrine Command. In 2008 had hij tijdelijk de leiding over de United States Central Command.

Op 30 september 2015 ging hij met pensioen. Zijn opvolger is Generaal Joseph F. Dunford, Jr.

Militaire loopbaan
 Second Lieutenant:  5 juni 1974
 First Lieutenant: 5 juni 1976
 Captain: 8 augustus 1978
 Major: 1 september 1985
 Lieutenant Colonel: 1 april 1991
 Colonel: 1 september 1996
 Brigadier General: 1 augustus 2001
 Major General: 1 september 2004
 Lieutenant General: 8 september 2005
 General: 8 december 2008

Decoraties
 Defense Distinguished Service Medal
 Army Distinguished Service Medal
 Defense Superior Service Medal
 Legion of Merit
 Bronze Star with Valor
 Meritorious Service Medal (United States)
 Joint Service Commendation Medal
 Achievement Medal with bronze Oak Leaf Cluster
 Joint Meritorious Unit Award with bronze Oak Leaf Cluster
 Valorous Unit Award with bronze Oak Leaf Cluster
 Superior Unit Award with bronze Oak Leaf Cluster
 National Defense Service Medal with two bronze service stars
 Southwest Asia Service Medal with three bronze service stars
 Iraq Campaign Medal
 Global War on Terrorism Expeditionary Medal
 Global War on Terrorism Service Medal
 Army Service Ribbon
 Army Overseas Service Ribbon with award numeral "4"
 NATO Medal voor dienst in ISAF
 Kuwait Liberation Medal (Saudi Arabia)
 Kuwait Liberation Medal (Kuwait)
 Combat Action Badge
 Basic Parachutist Badge
 Office of the Joint Chiefs of Staff Identification Badge
 Army Staff Identification Badge
 1st Armored Division Combat Service Identification Badge
 3rd Armored Cavalry Regiment Distinctive Unit Insignia
 7 Overseas Service Bars

Amerikaans generaal
Chairman of the Joint Chiefs of Staff
Chief of Staff of the United States Army