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Map of the world of the army forms

Colour key:

• Green: No armed forces
• Blue: Fully voluntary/professional army
• Orange: Conscription, but abolition of conscription decided upon (
• Red: Conscription (in some cases limited)
• Grey: No information

An army (from Latin armata "act of arming" via Old French armée), in the broadest sense, is the land-based armed forces of a nation. It may also include other branches of the military such as an air force. Within a national military force, the word Army may also mean a field army, which is an operational formation, usually made up of one or more corps.

In several countries the army is officially called the Land Army to differentiate it from an air force called the Air Army, notably France. In such countries, the word "army" on its own retains its connotation of a land force in common usage. The current largest army in the world by number of active troops is the People's Liberation Army with 2,250,000 active troops.

A Field Army is composed of a headquarters, army troops, a variable number of corps, and a variable number of divisions. A battle is influenced at the Field Army level by transferring divisions and reinforcements from one corps to another to increase the pressure on the enemy at a critical point. Armies are controlled by a General or Lieutienant General.

People's Liberation Army in dress uniform, currently the biggest army in the world, in number of people.

Standard symbol for a numbered Army, the X'es are not substituting the army's number.

A particular army can be named or numbered to distinguish it from military land forces in general. For example, the First United States Army and the Army of Northern Virginia. In the British Army it is normal to spell out the ordinal number of an army (e.g. First Army), whereas lower formations use figures (e.g. 1st Division).

Armies (as well as army groups and theaters) are large formations which vary significantly between armed forces in size, composition, and scope of responsibility.

In the Soviet Red Army and the Soviet Air Force, "Armies" were actually corps-sized formations, subordinate to an Army Group-sized "front" in wartime. In peacetime, a Soviet army was usually subordinate to a military district.

For the hierarchy of land forcedom organizations, see military organization.

• Military unit
• War
• Military history
• Paramilitary
• Militia
• Mercenary
• List of armies
• List of armies by country
• List of armies by number
• List of countries by size of armed forces
• List of countries by number of active troops
• List of countries by number of total troops

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