| John I de Montfort | |
| Noble Family: | House of Montfort |
| Father: | Amaury de Montfort |
| Mother: | Béatrice of Burgundy |
| Spouse: | Jeanne de Châteaudun |
| Issue: | Beatrice, Countess of Montfort |
| Birth Date: | 1228 |
| Birth Place: | France |
| Death Date: | 1249 (aged 21) |
| Death Place: | Cyprus |
John I de Montfort (1228 – 1249), Count of Montfort from 1241 to 1249, was the son of Amaury de Montfort, Count of Montfort, and of Béatrice of Burgundy. In 1248 he joined Louis IX's crusader fleet. Once the fleet arrived at Limassol, it was scattered by fierce storms and was forced to wait there to regroup. John died of sickness, while awaiting the rest of Louis's forces in Cyprus.
In March 1248 he married Jeanne de Châteaudun, Dame of Château-du-Loir, daughter of Geoffrey VI, Viscount of Châteaudun, and of Clémence des Roches. Their only child was: