Paris Métro Line 13 is one of the sixteen lines of the Paris Métro. It was built by the Nord-Sud Company before becoming Line 13 when the Nord-Sud was merged into the Compagnie du chemin de fer métropolitain de Paris (CMP) in 1930. Line 13 was extended in 1976 to reach the northern end of Line 14, which was then absorbed into it. The number 14 was eventually reused for a new line in 1998.

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.