| John Duffy | |
| Birth Date: | 1886 |
| Birth Place: | Cleator Moor, Cumberland, England |
| Position: | Centre half |
| Clubs1: | Workington |
| Years2: | 1909–1910 |
| Clubs2: | Bradford City |
| Caps2: | 1 |
| Goals2: | 0 |
| Clubs3: | Exeter City |
| Clubs4: | Swansea Town |
John Duffy (born 1886) was an English professional footballer who played as a centre half.
Duffy played for Workington, Bradford City, Exeter City,[1] and Swansea Town.[2]
For Bradford City he made one appearance in the Football League.[3]