Line 11 (Italian: Linea 11), also known as the Rainbow Line (Italian: Linea Arcobaleno), as each station is identified by a different colour, is a rapid transit line, part of the Naples Metro, in Naples, Italy.

The line connects Naples (Piscinola Scampia station) to the town of Aversa.

Only Piscinola station (shared with line 1) is within the municipality of Naples.

The line is managed by Ente Autonomo Volturno (EAV) company.

The first section of the line, between Piscinola and Mugnano, was opened in 2005.