Transdev was a major international public transport group based in Issy-les-Moulineaux near Paris, France and operating in several countries. Originally created as Société centrale pour l'équipement du territoire in 1955 and developing transportation activities since 1973, Transdev was a subsidiary Caisse des Dépôts et Consignations, a French stated-owned financial institution. As part of this merger, the RATP Group, a minority shareholder in Transdev, took direct ownership of a number of former Transdev operations in lieu of a cash payment. On March 3, 2011, the group merged with Veolia Transport, one of its main competitors, into Veolia Transdev.During 2013, Veolia Transdev was renamed to simply Transdev, recognising the planned withdrawal of Veolia Environnement from ownership of the group.

The world's most multi-modal company, Transdev connects people and communities through train, tram-train, metro, light rail, coach, bus, BusWay®, paratransit, ferry, taxi, car-sharing, shared-ride airport shuttle and bicycle. Transdev completes the missing links in the mobility chain.