Users
- : Belgian Army 11 M110A2 between 1972 and 1993.
- : Egyptian Army Received 144 M110A2 as aid in 1996.
- : German Army M110A2 until 1993.
- : Greek Army 145 M110-A2 to be scrapped.
- : Islamic Republic of Iran Army.
- : Israeli Army.
- : Japan Ground Self-Defense Force as M110A2.
- : Jordanian Armed Forces as M110A2.
- : Republic of Korea Army M110 until 2008.
- : Moroccan Army as M110A2.
- : Pakistan Army (260)
- : Royal Bahraini Army 13 M110A2 from Netherlands delivered in 1994, 25 M110A2 from US delivered in 1996.
- : Royal Netherlands Army M110A1 and M110A2, replaced by the M109 in the 1990s
- : Spanish Army as M110A2, deployed in divisional fire support regiments until 2009.
- : Republic of China Army 60 as M110A2.
- : Turkish Army, currently phasing out M110A2 in favor of T-155 Fırtına
- : British Army as M110A2 firing high explosive and nuclear shells only. (The FV433 Abbot SPG, the M109A2, and the M110A1 were replaced by the AS-90 in the early-mid 1990s.) Used in combat in Operation Granby/Gulf War.
- : US Army & United States Marine Corps.
- : Army of the Republic of Vietnam.
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