- 1966 ~ limited service (Iran–Iraq War, Gulf War 1991)
- British (export to others)
- Chieftain Mk.5 - final production variant, with upgrades to the engine and NBC protection system.
- Chieftain Mk.6-9 - Incremental upgrades to earlier Marks(ie: Mk.5) of tanks, including addition of Clansman radios.
- Chieftain Mk.10 - Mark 9 upgrade, addition of Stillbrew Crew Protection Package to the turret front and turret ring.
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