Belmont is an 'L' station serving the CTA's North Side Main Line. It is served at all times by the Red and Brown Lines, and by the Purple Line Express during weekday rush hours. It is located at 945 West Belmont Avenue in the Lakeview neighborhood of Chicago, Illinois. It is an elevated station with two island platforms serving four tracks; Brown and Purple Line trains share the outer tracks while Red Line trains run on the inner tracks. Along with residential areas, the neighborhood surrounding Belmont contains many eclectic shops, bars, and restaurants and active nightlife. The station is one of the more heavily utilized on the system serving as a busy transfer point, and also as a terminal when the Brown Line operates as a shuttle service to and from Kimball late at night and early in the morning. It is nearly identical to Fullerton, minus the terminal status.

The Northwestern Elevated Railroad was the last of the privately constructed rapid transit lines to be built in Chicago. The line ran from the Loop in downtown Chicago north to Wilson Avenue in Chicago's Uptown neighborhood with a branch to Ravenswood and Albany Park that left the main line at Clark Street. The Ravenswood line is now operated as the Brown Line, while the Main Line is used by the Purple and Red Lines.