Hanzer Frères, Hanzer, was a French manufacturer of automobiles. The Petit-Ivry company of Ivry-sur-Seine began building automobiles in 1899. Production ended in 1903.
In 1899 the first model produced was a tricycle.
In 1900 they introduced a voiturette powered by a 3 Hp De Dion-Bouton engine.
In 1901 both two and four-seater models were produced with 6 Hp engines from the Parisian builder Ateliers de Construction Mecanique l'Aster (Aster).
In 1902 the Parisian Durey-Sohy () company took over production. A 1902 vehicle survives in the Bentley Wildfowl and Motor Museum at Halland, East Sussex. It is occasionally used in the London to Brighton Veteran Car Run.
In 1903 the range consisted of the 5 HP and 6 HP single-cylinder models and the 9 HP two-cylinder model.