- Afghanistan: 63
- Albania: 130
- Argentina: 580
- Australia (Australian Army): 700
- Bahrain: 239 (est.) US-origin M113A2, 15 US-origin M577A2, 3 Netherlands-origin M577A1
- Bangladesh (Bangladesh Army): 10 in active service
- Belgium (Belgian Army): 500
- Benin: 16 (former Belgian)
- Bolivia: (Bolivian Army): 50
- Bosnia and Herzegovina: 80
- Brazil: Brazilian Army: 584; Brazilian Marine Corps: 29
- Canada: 289 (Canadian Army) - 1,143 Purchased from the mid-1960s through the 1990s. Mostly declared surplus. 289 to be upgraded to various configurations and retained until 2020.
- Chile (Chilean Army): 427
- Colombia: 120
- Cyprus: 8 (one captured example marked "239943")
- Democratic Republic of the Congo: 12
- Denmark: 632 (Designated PMV, Pansret Mandskabsvogn, literally translated to APC. All heavily modified. The M113 is slowly being replaced in the mechanized infantry by the MK35DK.)
- Ecuador: 20
- Egypt: 2,950
- El Salvador: 20
- Ethiopia: 110
- Greece: Over 2,500 (1,800+ M113A1/A2 APC, 256 M106A1/A2, 280+ M901A1/A2 ITV, 198 M577A2, 50 M113A1 MEDEVAC
- Iran (Iranian Army): 200
- Iraq (Iraqi Army): 283, plus a recent order for 440 refurbished M113A2s. It has been suggested that Iraq intends to buy a fleet of 1026.
- Israel (Israeli Defence Forces): 6,131
- Italy (Italian Army), (Carabinieri): 3,000+ (Slowly being replaced by the Dardo IFV and Lince VTML)
- Jordan: 1300
- South Korea (South Korean Army): 400
- Kuwait: 80
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- Lebanon (Lebanese Army): 1100+
- Libya: One M577 converted to IFV with added 2A28 Grom turret taken from BMP-1.
- Lithuania (Lithuanian Land Force): 210 (as of 2008). Overall 361 items were transferred from Germany between 2000 and 2006.
- Morocco: 1,200
- Republic of Macedonia: 30
- Netherlands (Royal Netherlands Army), (Royal Marechaussee): replaced with YPR-765
- New Zealand (New Zealand Army): 120 (replaced with NZLAV lll)
- Norway (Norwegian Army): 900
- Pakistan: 1,600+
- Peru: 130
- Philippines:Philippine Army: 100+
- Poland (Polish Land Forces): 35 (command and medical evacuation variants)
- Portugal (Portuguese Army): 180 M113A1/A2 APC (150 in service), 4 M901 ITV, 30 M48A3 Chaparral (25 in service), 47 M577A2 (36 in service as command vehicles and 3 in service as ambulance vehicles)
- Saudi Arabia (Saudi Arabian Army), (Saudi National Guard): 3,000
- Singapore (Singapore Armed Forces): 1,200 (being replaced by Bionix AFVs)
- Spain: 860 (being replaced by the Pizarro IFV)
- Sweden: 1 (for evaluation)
- Switzerland: 400
- Republic of China (Taiwan) (Republic of China Army): 675
- Thailand: 385
- Tunisia: 120
- Turkey: 3,000+ (slowly replacing with ACV-300)
- United Nations: 6 (used in the Congo 1963–1964)
- United States: 6000
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- The M113 is also used by NASA for emergency evacuation of astronauts during a launch pad emergency, as well as some police SWAT units, like the Phoenix, Arizona police department.
- Uruguay: 24
- Vietnam: 750
- Yemen: 670
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