Guillaume de Sonnac | |
|---|---|
 Coat of arms of Guillaume de Sonnac | |
| 18th Grand Master of the Knights Templar | |
| In office 1247–1250 | |
| Preceded by | Richard de Bures |
| Succeeded by | Renaud de Vichiers |
| Personal details | |
| Born | Unknown Rouergue, France |
| Died | 6 April 1250 Faraskur, Egypt |
| Military service | |
| Allegiance |  Knights Templar |
| Battles/wars | |
Guillaume de Sonnac (died 6 April 1250) was Grand Master of the Knights Templar from 1247 to 1250.