William X, Duke of Aquitaine
| William X | |
|---|---|
| Born | c. 1098 Toulouse |
| Died | 9 April 1137 (aged 37–38) Santiago de Compostela, Spain |
| Spouse | Aénor de Châtellerault |
| Issue | |
| House | Poitiers |
| Father | William IX, Duke of Aquitaine |
| Mother | Philippa, Countess of Toulouse |
William X (Occitan: Guillém X; c. 1099 – 9 April 1137), called the Saint, was Duke of Aquitaine, Duke of Gascony, and Count of Poitou (as William VIII) from 1126 to 1137.