| 21 South African Infantry Battalion | |
|---|---|
 21 South African Infantry emblem | |
| Active | 1 January 1991 |
| Country |  South Africa |
| Branch |  South African Army |
| Type | Internal Stability |
| Part of | South African Infantry Formation |
| Garrison/HQ | Doornkop, Johannesburg |
| Motto(s) | Nostro operi fideles (Sure of our work) |
| Insignia | |
| Company level insignia |  |
| SA Motorised Infantry beret bar circa 1992 |  |
21 South African Infantry Battalion is an infantry battalion of the South African Army. The unit has its origin as 21 Battalion, an apartheid era unit used to train black South African men as soldiers.