Air commodore (Air Cdre or Air Cmde) is an air officer rank used by some air forces, with origins from the Royal Air Force. The rank is also used by the air forces of many countries which have historical British influence and it is sometimes used as the English translation of an equivalent rank in countries which have a non-English air force-specific rank structure.

Air commodore is immediately senior to group captain and immediately subordinate to air vice-marshal. It is usually equivalent to a commodore or a brigadier/brigadier general.

The equivalent rank in the Women's Auxiliary Air Force, Women's Royal Air Force (until 1968) and Princess Mary's Royal Air Force Nursing Service (until 1980) was "air commandant".

The rank was used in the Royal Canadian Air Force (RCAF) until the 1968 unification of the Canadian Forces, when army-type rank titles were adopted. Canadian air commodores then became brigadier-generals. In official Canadian French usage, the rank title was commodore de l'air. The position of honorary air commodore still exists in the Royal Canadian Air Cadets.^{[citation needed]}

In the present-day RAF, air commodores typically hold senior appointments within groups, acting directly in support of the air officer commanding. However, during the inter-war period, and in the case of the contemporary No. 83 Expeditionary Air Group, the air officer commanding held or holds air commodore rank. In the Air Training Corps, an appointed air commodore holds ultimate authority over the cadet organisation as the Commandant Air Cadets.

On 1 April 1918, the newly created RAF adopted its officer rank titles from the British Army, with officers at what is now air commodore holding the rank of brigadier-general. In response to the proposal that the RAF should use its own rank titles, it was suggested that the RAF might use the Royal Navy's officer ranks, with the word "air" inserted before the naval rank title. Although the Admiralty objected to this simple modification of their rank titles, it was agreed that the RAF might base many of its officer rank titles on Navy officer ranks with differing pre-modifying terms. It was also suggested that air-officer ranks could be based on the term "ardian", which was derived from a combination of the Gaelic words for "chief" (ard) and "bird" (eun), with the term "fourth ardian" or "flight ardian" being used for the equivalent to brigadier-general and commodore. However, the rank title based on the Navy rank was preferred and air commodore was adopted in August 1919.

The rank insignia is a light-blue band on a broad black band worn on both the lower sleeves of the tunic or on the shoulders of the flying suit or the casual uniform. On the mess uniform, air commodores wear a broad gold ring on both lower sleeves.

The command flag of an air commodore has one narrow red band running through the centre and is rectangular with a cut-away section giving it two tails. It is the only RAF command flag of this shape and it is similar in shape to that of a Royal Navy commodore's broad pennant. The vehicle star plate for an air commodore depicts a single white star (air commodore is equivalent to a one-star rank) on an air force blue background. RAF air commodores are classed as air officers and as such have two rows of gold oak leaves on the peak of their service dress hats.