| William Clay | |
| Fullname: | William Clay |
| Birth Date: | 1883 |
| Birth Place: | Belfast, Ireland |
| Position: | Leftback |
| Years1: | – |
| Caps1: | ? |
| Goals1: | ? |
| Years2: | 1903 |
| Caps2: | 7 |
| Goals2: | 0 |
| Years3: | – |
| Clubs3: | Belfast Celtic |
| Caps3: | ? |
| Goals3: | ? |
| Years4: | 1905 |
| Clubs4: | Leeds City |
| Caps4: | 0 |
| Goals4: | 0 |
| Years5: | – |
| Clubs5: | Derry Celtic |
| Caps5: | ? |
| Goals5: | ? |
William Clay (born 1883 in Belfast, Ireland) was a footballer who played in the Football League for Sheffield United and Leeds City.[1]