The 340th Squadron (Greek: 340 Μοίρα, 340 M), callsign "Fox" (ΑΛΕΠΟΥ), is a squadron in service with the Hellenic Air Force, forming part of the 115th Combat Wing.

The squadron was established on 18 April 1953 as the 340 Fighter-Bomber Squadron (340 Μοίρα Διώξεως/Βομβαρδισμού), at the Elefsis Air Base, equipped with F-84G Thunderjets.

In September it moved to the newly established Nea Anchialos Air Base.

[1] In May 1958, the squadron began delivery of F-84F Thunderstreaks, moving in February 1960 to 115th Combat Group (later the 115th Combat Wing) at Akrotiri, Crete.

During the emergency after the Turkish invasion of Cyprus in July 1974, this allowed the squadron to establish three detachments, which soon were spun off into separate squadrons: 3401st, 3402nd, and 3403rd.