The RATP Group (French: Groupe RATP) is a French state-owned enterprise (EPIC) that operates public transport systems primarily in Paris, France. Headquartered in Paris, it originally operated under the name Régie autonome des transports parisiens (English: Parisian Autonomous Transport Administration, lit. 'Autonomous Management of Parisian Transportation'). Its logo represents the Seine's meandering path through the Paris Region stylised as the face of a person looking up. The company had described itself as the fourth-largest presence in public transport.

RATP Group was established in 1949 with the express purpose of operating Paris's public transport system. During the twentieth century, it focused solely on the provision of the capital's various forms of transit, from the Paris Métro, Île-de-France tram, and the RATP bus network, as well as part of the regional express rail (RER) network. However, since 2002, RATP Group's operations have no longer been geographically restricted; it has competitively pursued contracts to operate transit systems around the world. It also had a partnership with, and a minority shareholding in, Transdev, which has further involved RATP Group in various global transport operations. During 2002, RATP Dev was created as the Group's dedicated international operations and maintenance subsidiary; it is present in 16 countries across Africa, Asia, Australia, Europe and North America.

RATP Group's Paris-related activities are still a major part of its business through to the present day; in 2019, it was recorded that, in the Île-de-France region, it carried roughly 3.3 billion passengers per year. In 2019, RATP Group's consolidated revenue was €5.704 billion; it employed 64,000 people at that time. In recent decades, the company has operated on an increasingly competitive basis as a result of legislative changes.

The RATP was created on 1 January 1949 by combining the assets of the Compagnie du chemin de fer métropolitain de Paris (CMP), which operated the Paris Métro, and the Société des Transports en Commun de la Région Parisienne (STCRP), which operated the city's bus system.

Prior to this, the CMP had absorbed the Nord-Sud Company in 1930 and the Ligne de Sceaux in 1937, which operated commuter rail to the suburbs.^{[citation needed]} The STCRP had been created on 1 January 1921 by the merger of about half a dozen independent bus and streetcar operators in the Paris area. By the time the STCRP was merged into the RATP, all of its streetcars had been replaced by bus routes.^{[citation needed]}

A major change in French law came on 3 November 2009, when article 5 of the ARAF (French rail regulatory body) law came into effect. This law opens public transport operation to competition. The law was part of a broader push by the European Union to open all passenger transport operation to competition. Under this law, the RATP Group lost the exclusive right to operate all new public transport lines immediately. The company's exclusive operation rights for existing lines would expire over time, with the bus network going out to bid 15 years later in 2024, the tram network (Lines T1, T2 & T3) going out to bid 20 years later in 2029, and the Metro and RER lines out to bid 30 years later in 2039.

With the RATP anticipating this shift to a competitive environment, the company began to reorganize itself.

In the early years of the 21st century, a partnership with Transdev resulted in RATP acquiring a minority shareholding in that group, with its many worldwide transport operations. However, in 2009, the Caisse des dépôts et consignations, the majority owner of the Transdev, started negotiations with Veolia to merge Transdev with Veolia Transport. As part of the resulting agreement, made in May 2010, it was agreed that RATP would take over ownership of some of Transdev's operations in lieu of cash payment for its holdings in Transdev. This gave RATP a considerable number of international operations.