A regular army is the official army of a state or country (the official armed forces), contrasting with irregular forces, such as volunteer irregular militias, private armies, mercenaries, etc. A regular army usually has the following:

A regular army may be:

In the United Kingdom and the United States, the term Regular Army means the professional standing active duty army, as different from the reserve component: the Army Reserve (formerly the Territorial Army) in the United Kingdom and the U.S. Army Reserve and the Army National Guard in the United States.