Variants

* Ye-2 (NATO: "Faceplate") : Swept-wing prototype.
* Ye-4 (I-500) : The first delta wing prototype of the MiG-21.
* Ye-5 (NATO: "Fishbed") : Delta wing research prototype.
* Ye-6 : Three pre-production aircraft.
* MiG-21 : The first series of fighters.
* MiG-21F (NATO: "Fishbed-B") : Single-seat day fighter aircraft. It was the first production aircraft, with 40 machines being made. The MiG-21F was powered by a Tumansky R-11 turbojet engine and armed with two 30-mm NR-30 cannon. Prototype Ye-6T was redesignated MiG-21F.
* Ye-50 : Swept-wing research prototype.
* Ye-66 : Single-seat version, built for breaking the world speed record.
* Ye-66A : Built to break the world altitude record.
* Ye-66B :
* Ye-76 :
* Ye-150: Interceptor prototype, essentially an enlarged MiG-21
* Ye-152 (NATO: "Flipper") : Bigger than a MiG-21, the Ye-152 'Flipper' was a high-performance aircraft, which achieved at least 3 world records.
* MiG-21F-13 (NATO: "Fishbed-C") : Single-seat, short-range day fighter. The MiG-21F-13 was the first mass-production model. The MiG-21F-13 was powered by a Tumansky R-11 turbojet engine, it was armed with two Vympel K-13 (AA-2 'Atoll') air-to-air missiles, and one 30-mm NR-30 cannon. The Type 74 is the Indian Air Force designation. The MiG-21F-13 was made in China, and designated Chengdu J-7 or F-7 for export.
* MiG-21FL : Export model of the MiG-21PF. Built under licence in India as the Type 77.
* MiG-21I (NATO: "Analog") : Testbed for the wing design of the Tu-144 (NATO: 'Charger') supersonic transport.
* MiG-21SPS : East German version.
* MiG-21P (NATO: "Fishbed-D") : Single-seat, limited all-weather interceptor fighter. Armed with air-to-air missiles only. Also called "Fishbed-E" by NATO.
* MiG-21PF (NATO: "Fishbed-D") : Single-seat, limited all-weather fighter, equipped with a RP21 Sapfir radar. The MiG-21PF is the second production model. Prototype Ye-7, Type 76 Indian Air Force designation. Also called "Fishbed-E" by NATO.
* MiG-21PF (SPS) (NATO: "Fishbed-E") :
* MiG-21PFM (NATO: "Fishbed-F") : Single-seat, limited all-weather fighter, with upgraded radar and a more powerful engine. Improved version of the MiG-21PFS.
* MiG-21PFS (NATO: "Fishbed-F") : Single-seat, limited all-weather fighter, with upgraded radar and a more powerful engine.
* MiG-21 (NATO: "Fishbed-G") : Experimental short take-off and landing aircraft.
* MiG-21R (NATO: "Fishbed-H") : Single-seat tactical reconnaissance version of the MiG-21PFM.
* MiG-21RF (NATO: "Fishbed-J") : Single-seat tactical reconnaissance version of the MiG-21MF.
* MiG-21S (NATO: "Fishbed-J") : Single-seat interceptor fighter version, equipped with an RP-22 radar and an external gun pod. (Incorrectly identified by NATO as the MiG-21PFMA); E-8, Type 88 Indian Air Force designation.
* MiG-21SM : Single-seat interceptor fighter version, powered by a Tumansky R-13-300 turbojet engine.
* MiG-21PFV : High-altitude version (perekhvatchik forsirovannij visotnij, high-altitude boosted interceptor).
* MiG-21M : Export version powered by a Tumansky R-13 turbojet engine. Built under license in India as the Type 96.
* MiG-21MF : Export version powered by a Tumansky R-13 turbojet engine.
* MiG-21MF (NATO: "Fishbed-J") : Single-seat multi-role fighter version, equipped with a RP-22 radar, powered by a Tumansky R-13-300 turbojet engine.
* MiG-21SMT (NATO: "Fishbed-K") : Single-seat multi-role fighter version, powered by a Tumansky R-13 turbojet engine. Increased fuel and ECM capability. (E-9, block 94 and 96)
* MiG-21bis (NATO: "Fishbed-L") : Single-seat multi-role fighter and ground-attack aircraft. The final production model. This version is powered by a Tumansky R-25-300 turbojet engine.
* MiG-21bis (NATO: "Fishbed-N") : Single-seat multi-role fighter and ground-attack aircraft.
* MiG-21U (NATO: "Mongol-A" : Two-seat training version of the MiG-21F-13. Type 66 Indian Air Force designation.
* MiG-21US (NATO: "Mongol-B" : Two-seat training version. Type 68 Indian Air Force designation.
* MiG-21UT : Two-seat trainer.
* MiG-21UM (NATO: "Mongol-B") : Two-seat training version of the MiG-21MF. Type 69 Indian Air Force designation.
* JJ-7 : Two-seat training version of the J-7. FT-7 export designation of the JJ-7.
* MiG-21-93 Bison : Upgraded version for the Indian Air Force.
* MiG-21 Lancer Upgraded version for the Romanian Air Force.
* G15 VMT.
* MiG-21MFN Upgraded version for the Czech Air force (navigation and communication systems for compatibility with NATO).