Most produced fighter jet in world?

The most produced fighter in the world would be the Soviet Ilyushin Il-2 with 36.000+ aircraft produced.

Answer:

This is incorrect on at least two counts. The Il-2 was not a jet, nor was it a fighter.

But at least the nationality is correct.

There were over 18,000 MiG-15s built, followed by (estimates vary) 11-13,000 MiG-21s.