The Brown Line (or the Ravenswood Line) of the Chicago "L" system, is an 11.4-mile (18.3 km) route with 27 stations between Chicago's Albany Park neighborhood and downtown Chicago. It runs completely above ground and is almost entirely grade-separated. It is the third busiest 'L' route, with an average of 101,881 passengers boarding each weekday in 2011.

The Brown Line operates to the Loop weekdays and Saturdays from 4:00 am to 1:30 am and on Sundays from 5:00 am to 1:30 am. The Brown Line Shuttle service, running only between Kimball and Belmont, runs from 4:00 am to 2:20 am on weekdays and Saturdays, and 5:00 am to 2:00 am on Sundays. At Belmont, southbound riders can transfer to the 24-hour Red Line.