The S1 is a service on the Munich S-Bahn network. It is operated by DB Regio Bayern. It runs from Munich Airport station and Freising to Neufahrn bei Freising station, where most trains are coupled. Trains continue via Feldmoching, Laim, central Munich to Munich East.

The Munich S-Bahn is an electric rail transit system in Munich, Germany. "S-Bahn" is the German abbreviation for Stadtschnellbahn, and the Munich S-Bahn exhibits characteristics of both rapid transit and commuter rail systems.