34 Fighter Squadron (Finnish: Hävittäjälentolaivue 34 or HLe.Lv.34 on 14 February 1944) was a fighter squadron of the Finnish Air Force during World War II.

34 Squadron achieved 345 confirmed kills, all with Bf 109Gs.

The unit lost 30 aircraft (13 in air combat, 5 to anti-aircraft fire, 7 in accidents and 5 due to technical faults).

33 Squadron when the Finnish Air Force demobilized after the end of the Continuation War.

The unit had also one captured Hawker Hurricane Mk.IIA in its possession, but it never flew any operational sorties.