An adjutant general is the chief administrative officer to a military general.

In the United States, an adjutant general may administer any major military unit, including a division, state guard unit, militia, corps, etc. Adjutant generals are often tasked with maintaining personnel records and as such sometimes have oversight over veterans' institutions. An adjutant general is the senior military officer and de facto commander of the National Guard of each state.

In the United Kingdom, the Adjutant-General to the Forces is the head of the British Army's infrastucture and administration and the second most senior general in the Army after the Chief of the General Staff. Chief administrative officers in other formations are entitled Deputy, Assistant or Deputy Assistant Adjutant-Generals. The Adjutant General's Corps is tasked with the administrative management of personnel.