Line C is the third line of the metro system of Rome, Italy extending from Monte Compatri-Pantano in the eastern suburbs of Rome to Lodi (its current western terminus); it is also the first fully automated metro line in the city. The first section, between Monte Compatri-Pantano and Parco di Centocelle, opened on 9 November 2014; the second, from Parco di Centocelle to Lodi, opened on 29 June 2015. The line is not yet connected to the other two metro lines in Rome, though the interchange with Line A is expected to be complete in April 2018. The line reuses parts of the old Rome-Pantano railway, a light railroad that is the last remaining part of the Rome-Fiuggi railway.

Archeological investigations began in August 2006, before the first construction sites opened in March 2007 on Piazza Roberto Malatesta, to construct Malatesta station. The Lodi station followed one month later.

In May 2008, crews constructed two Tunnel Boring Machines at Giardinetti, and two months later the old Rome-Pantano railway was truncated at Giardinetti to allow restructuring part of the old surface line, which forms a part of the new metro. This section, from Montecompatri-Pantano to , opened in 2014. The section between Parco di Centocelle to Lodi opened on 29 June 2015, one further station (San Giovanni) is slated to open in late April 2018. The section of Line C further west is partly under construction (to Fori Imperiali-Colosseo with one further station in between) and is due to open in 2022. Planning for an additional station at Piazza Venezia is currently in the planning phase and funding has been secured. Project planning for further extensions crossing the city centre (from Venezia to Clodio-Mazzini) was suspended in 2010. A shortened extension to Ottaviano (thus providing a second interchange with Line A) is again under discussion.

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