The Rome Metro (Italian: Metropolitana di Roma) is an underground public transportation system that operates in Rome, Italy. It was opened in 1955. There are currently two lines, A line (identified by the orange colour) and B line (blue). A third service, the green C line, and a new branch of the B line, are currently under construction. Plans have also been revealed even for a fourth line. The current network (38 km) has an X-shape with the two currently existing line intersecting at Termini Station, the main train station in Rome.

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The A line connects the north-west of the city with the south-east. It currently has 27 stations with terminuses at Battistini and Anagnina. Its distinguished by the colour orange.

Approval was given for the construction of the Rome's second metro line in 1959. Subsequently called the A line it would run roughly perpendicularly to the existing metro line, now called the B line.

Notwithstanding its name, the B line was in fact the first metro line in Rome. The line B connects the north-east of the city with the south-west. It currently has 22 stations with terminuses at Rebibbia and Laurentina (just east of EUR). Its distinguished by the colour blue.