De Dion may refer to:
- Jules-Albert de Dion (1856–1946), automobile pioneer
- de Dion-BoutonDe Dion-BoutonDe Dion-Bouton was a French automobile manufacturer and railcar manufacturer operating from 1883 to 1932. The company was founded by the Marquis Jules-Albert de Dion, Georges Bouton and his brother-in-law Charles Trépardoux....
, automobile manufacturer
- de Dion tubeDe Dion tubeA de Dion tube is an automobile suspension technology. It is a sophisticated form of non-independent suspension and is a considerable improvement over the alternative swing axle and Hotchkiss drive types. A de Dion suspension uses universal joints at both the wheel hubs and differential, and uses a...
, automobile suspension (vehicle)