The line S7 (Italian: Linea S7) is a commuter rail route forming part of the Milan suburban railway service (Italian: Servizio ferroviario suburbano di Milano), which converges on the city of Milan, Italy.

Like all the other Milan suburban railway service routes, it is operated by Trenord.

Line S7, a radial route, heads initially in an northeasterly direction from Milan to Monza.

[3] The route was activated on 14 December 2014, substituting the former R19 regional service.

[4] It is the sole line of the suburban service which runs on a section with a single track without electrification (line S9 also runs on a minor single track section, though it is completely electrified), so it is the sole line with a single ride per hour, running half-hourly only in peak hours and in the peak direction (Milan in the morning, Lecco in the evening).