| Unit Name: | 21st Infantry Division of Azarbaijan |
| Native Name: | لشکر ۲۱ پیاده |
| Branch: | Ground Forces of Islamic Republic of Iran Army |
| Type: | Infantry |
| Size: | Division |
| Garrison: | Tabriz, East Azerbaijan Province |
| Nickname: | "Hamzeh" (Persian: حمزه) |
| Colours: | --> |
| Colours Label: | --> |
| Battles: | Iran–Iraq War |
| Commander2: | 2nd Staff Brig. Gen. Nader Najafi[1] |
| Commander2 Label: | Current commander |
21st "Hamzeh" Division of Azarbaijan (Persian: لشکر ۲۱ حمزه آذربایجان), based in Tabriz, East Azerbaijan Province, established as combination of the 2nd Guards Brigade and the 1st Infantry Division in Tehran, with total of four mechanized formations (including brigades of the former 1st Guards Division and Independent Guards Brigade, and 141st Infantry Battalion.
The division has participated in various operations of Iran–Iraq War, including Operation Beit ol-Moqaddas.