The 1976 Tehran UFO Incident was a radar and visual sighting of an unidentified flying object (UFO) over Tehran, the capital of Iran, during the early morning hours of 19 September 1976. During the incident, two Imperial Iranian Air Force F-4 Phantom II jet interceptors reported losing instrumentation and communications as they approached the object. These were restored upon withdrawal. One of the aircraft also reported a temporary weapons systems failure while the crew was preparing to open fire. An initial report of the incident was relayed to the U.S. Joint Chiefs of Staff on the day of the incident.

The history of the Iranian Air Force, currently known as the Islamic Republic of Iran Air Force, can be divided into two phases—before the Islamic Revolution, and after it.