| Japanese Fifty-First Army | |
|---|---|
&sq=Qlik&lang=&file=File:Operation_Coronet.jpg) Landing Map for Operation Downfall | |
| Active | April 18, 1945 – August 15, 1945 |
| Country | Empire of Japan |
| Branch | Imperial Japanese Army |
| Type | Infantry |
| Role | Corps |
| Garrison/HQ | Tsuchiura, Ibaraki |
| Nickname(s) | Ken (建, Build) |
| Engagements | Operation Downfall |
The Japanese 51st Army (第51軍, Dai-gojyūichi gun) was an army of the Imperial Japanese Army during World War II.