Twenty-First Army (Japan)
| Japanese Twenty-First Army | |
|---|---|
| Active | September 19, 1938 - February 19, 1940 | 
| Country | Empire of Japan | 
| Branch | Imperial Japanese Army | 
| Type | Infantry | 
| Role | Corps | 
| Garrison/HQ | Guangzhou | 
| Nickname(s) | none | 
| Engagements | Canton Operation | 
The Japanese 21st Army (第21軍, Dai-nijyūichi gun) was an army of the Imperial Japanese Army during the Second Sino-Japanese War.