Duke of Longueville

The title Duke of Longueville (Longueville-sur-Scie) was a French title of nobility, though not a peerage of France.

It was created in 1505 by King Louis XII of France for his first cousin once removed François d'Orléans, Count of Dunois, son of François d'Orléans, Count of Dunois, son of Jean d'Orléans, himself an illegitimate son of the Duke of Orléans. The title became extinct in 1694 following the death of Marie de Nemours. From 1648, Longueville was also Sovereign Prince of Neuchâtel, a Swiss territory. In 1654 the eighth duke was created a peer as Duke of Coulommiers but the peerage was never registered and so became extinct at his death.