The Paris Métro, operated by the Régie autonome des transports parisiens (RATP), is a rapid transit system in the Paris metropolitan area, France. A symbol of the city, it is known for its density within the capital's territorial limits, uniform architecture and unique historical entrances influenced by Art Nouveau. The system is 226.9 kilometres (141.0 mi) long, mostly underground. It has 308 stations of which 64 have transfers between lines. There are 16 lines, numbered 1 to 14, with two lines, Line 3bis and Line 7bis, named because they used to be part of Line 3 and Line 7, respectively. Line 1, Line 4 and Line 14 are automated. Lines are identified on maps by number and colour, with the direction of travel indicated by the terminus.

The RATP Group, is a French state-owned enterprise (EPIC) that operates public transport systems. It is headquartered in Paris, France, and originally operated under the name Régie autonome des transports parisiens. Its logo represents, in a stylized version, the Seine's meandering through the Paris area as the face of a person looking up. The company had described itself as the fourth-largest presence in public transport.