Operation Avak (Hebrew: מִבְצָע אָבָק, "Operation Dust") was a logistical and military operation conducted during the second truce of the 1948 Arab–Israeli War and later by the Israeli Air Force (IAF). Its objective was to send supplies to the Israeli enclave in the northwestern Negev desert by air, and create a suitable airfield for this purpose. The operation commenced on August 23, 1948, when the first aircraft landed at a newly created field in Ruhama (raising much dust, giving a name to the operation), and lasted until October 21, when a land corridor was created between the Negev and the rest of Israel.
A total of 417 flights were made during the operation, transporting 2,235 tons of supplies and 1,911 people to the Negev, and evacuating 5,098 people. Initially, Douglas C-54 Skymasters, Lockheed Constellations and Curtiss C-46 Commandos were used, but later, the IAF also made use of Douglas Dakotas and Noorduyn Norsemans. The main military obstacle was a seesaw battle with the Egyptian army at Khirbet Mahaz, lasting between September 29 and October 6.