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Major general (or major-general, short MG<ref>MILITÄRISCHES STUDIENGLOSAR ENGLISCH Teil I, L – Z, Bundessprachenamt (Stand Januar 2001), page 742, definition: major general [MG]. </ref>) is a military rank used in many countries. It is derived from the older rank of sergeant major general. The disappearance of the "sergeant" in the title explains the apparently confusing phenomenon whereby a lieutenant general outranks a major general. (Though a major outranks a lieutenant, a lieutenant outranks a sergeant-major.)

In the Commonwealth and United States, it is a division commander's rank subordinate to the rank of lieutenant general and senior to the rank of brigadier/brigadier general.

In some countries, including much of Eastern Europe, major general is the lowest of the general officer ranks, with no brigadier-grade rank above colonel.

In France, major general (major général) is an appointment, normally of corps general. The major general assists a chief of staff. There is one major general for the chief of staff of the armed forces as a whole, and one for each of the four armed forces chiefs (army, navy, air force and gendarmerie).

In some small countries, such as Estonia, major general is the highest rank currently used.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>

In the Commonwealth, major general is equivalent to the navy rank of rear admiral, and in air forces with a separate rank structure, it is equivalent to air vice-marshal.