Line C is the third line of the metro system of Rome, Italy running 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;. As of 2016^[update] the line is not yet connected to the other two metro lines in Rome, though it should interchange with Line A in 2017. The line reuses parts of the old Rome-Pantano railway, a light railroad that is the last remaining part of the Rome-Fiuggi railway.

From August 2006 onwards archeological investigations took place before construction could start. The first construction sites opened in March 2007, on Piazza Roberto Malatesta, to construct Malatesta station. Lodi station followed one month later.

In May 2008 two Tunnel Boring Machines were set up 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 stretch, from Montecompatri-Pantano to , was inaugurated in 2014. The section between Parco di Centocelle to Lodi was opened on 29 June 2015, one further station (San Giovanni) should open in 2017. 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 be opened 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 up 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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