The Balkan Air Force (BAF) was an Allied air formation operating in the Balkans during World War II. Composed of units of the Royal Air Force and South African Air Force under the Mediterranean Allied Air Forces command, it was active from 7 June 1944 until 15 July 1945. Air Vice Marshal William Elliot and then George Mills, both RAF officers, were its Air Officer Commanding (AOC).

The BAF operated mainly over Yugoslavia, supporting the Partisans against Germany and its allies, but occasionally supporting the Greek and Albanian resistance movements also.

The formation was based at Bari in Italy, and formed on 7 June 1944 from AHQ 'G' Force, to simplify command arrangements for the air support of Special Operations Executive-operations in the Balkans, i.e. across the Adriatic and in the Aegean and Ionian seas. The Desert Air Force had been responsible for those operations, but its prime job was the support of the troops of the Commonwealth Eighth Army which was fighting its way up through Italy, thus making operations over the Balkans a distraction. The Balkan Air Force was a subordinate to Mediterranean Allied Air Forces, the overall allied air formation in the Mediterranean.

The BAF mainly supported the operations of the Partisans, led by Josip Broz Tito, against German forces in Yugoslavia, but also provided support to Greek and Albanian resistance organisations. It transported supplies to the Partisans, evacuated wounded, dropped agents to help them, and provided air support in their operations against German troops.

The Balkan Air Force was a multinational unit, with 15 types of aircraft and men from eight nations: Greece, co-belligerent Italy, Poland, South Africa, Yugoslavia, the UK, USA and USSR (a transport squadron). Between its inception and May 1945 the BAF flew 38,340 sorties, dropped 6,650 tons of bombs, delivered 16,440 tons of supplies and flew 2,500 individuals into Yugoslavia and 19,000 (mostly wounded) out.

Towards the end of its existence, it operated a small number of units from Yugoslav soil to harass the retreating Germans. However, disagreements with Tito (particularly the arrest of members of the Special Boat Squadron on 13 April 1945, although they were quickly released) meant that all British ground forces were withdrawn, although BAF aircraft operating from Zadar continued to support the Partisan offensive. Between 19 March and 3 May they flew 2,727 sorties, attacking the German withdrawal route from Sarajevo to Zagreb and supporting the Fourth Yugoslav Army advancing from Bihać to Rijeka.

The Balkan Air Force was disbanded on 15 July 1945. During its short existence, it was commanded by (British) Royal Air Force Air Vice Marshals William Elliot and George Mills.

William Deakin, who had met up with the Partisans in May as a representative of Middle East GHQ, was attached as advisor to the newly formed Balkan Air Force, under (then) Air Vice Marshal Elliott, with headquarters at Bari, Italy. This body assumed responsibility for all operations by land, sea, and air into Central and South-Eastern Europe.