William Joynier | |
|---|---|
| Mayor of London | |
| In office 1239–1240 | |
| Preceded by | Richard Renger |
| Succeeded by | Gerard Bat |
| Sheriff of the City of London and Middlesex | |
| In office 1222–1223 | |
| Preceded by | Thomas Lambert |
| Succeeded by | John Travers |
| Personal details | |
| Died | c. 1248 |
| Occupation | Merchant, Banker |
Sir William Joynier was a rich 13th-century merchant and Sheriff of the City of London who served as Mayor of London from 1239 to 1240.