| William I | |
|---|---|
 Effigy of William on his seal | |
| Count of Holland | |
| Reign | 1203 – 4 February 1222 |
| Predecessor | Ada |
| Successor | Floris IV |
| Born | c. 1167 The Hague |
| Died | 4 February 1222 |
| Burial | |
| Spouse | |
| Issue and others... | |
| House | Holland |
| Father | Floris III, Count of Holland |
| Mother | Ada of Huntingdon |
William I (c. 1167 – 4 February 1222) was count of Holland from 1203 to 1222. He was the younger son of Floris III and Ada of Huntingdon.