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Line 1 (Italian: Linea 1; Italian pronunciation: [ˈliːnea ˈuːno]) is the oldest and one of the busiest lines of Naples Metro's mass transit rail network. The line that runs from Piscinola Scampia in suburban north-west Naples to Centro Direzionale in southeast Naples. Printed in yellow on the map, it serves 20 stations, 17 of which are underground, over 20.7 kilometres (12.9 mi). It is operated by ANM. The line has been renamed Metrò dell'Arte (Metro of Art) reflecting the presence of contemporary art works installed in some of its stations.
The line is in the process of being upgraded and expanded. When the upgrading works are completed, Line 1 will connect 27 stations and form a loop, and bring easier access to the city centre for residents of Chiaiano, Piscinola, and Scampia.