| William I of Geneva | |
| Noble Family: | House of Geneva |
| Father: | Amadeus I of Geneva |
| Mother: | Matilda de Cuiseaux |
| Spouse: | Marguerite Beatrice de Faucigny Agnes of Savoy Beatrice de Vaupergue |
| Issue: | Margaret of Geneva William II of Geneva |
| Birth Date: | 1132 |
William I of Geneva (1132 – 25 July 1195) was Count of Geneva from 1178 to 1195. He was the son of Amadeus I, Count of Geneva and Matilda de Cuiseaux.
William married Agnes of Savoy. They had:
Following his first wife's death c. 1172, William married Marguerite Beatrice de Faucigny, they had:
William's third marriage, to Beatrice de Vaupergue, his last wife, was childless. He died at the Château de Novel in Annecy, France.
. The Early History of the House of Savoy: 1000–1233 . Cambridge University Press . 1912 . Charles Previté-Orton.