The Thessaloniki Suburban Railway, is a three-line Proastiakos commuter rail service connecting the city of Thessaloniki with its metropolitan area and other regions beyond, including Imathia, Pella and Serres.

The Proastiakos is Greece's Commuter rail service, run by Hellenic Train, on rail infrastructure owned by the Hellenic Railways Organisation (OSE) (lines) and GAIAOSE. These services connect a participating city's central railway station to important locations such as a city's port or airport, as well as its suburbs and occasionally nearby towns and cities.