| City Cup | |
| Year: | 1920–21 |
| Country: |  Ireland |
| Num Teams: | 5 |
| Defending Champions: | Linfield |
| Winners: | Glenavon (1st win) |
| Second: | Glentoran |
| Matches: | 20 |
| Goals: | 35 |
| Prev Season: | 1919–20 |
| Next Season: | 1921–22 |
The 1920–21 City Cup was the 23rd edition of the City Cup, a cup competition in Irish football.[1]
The tournament was won by Glenavon for the 1st time.[2] [3]