List of public transport routes numbered 4

In public transport, Route 4 may refer to:

Route 4 (MTA Maryland), a bus route in the suburbs of Baltimore, United States Barcelona Metro line 4 in Barcelona, Spain NWFB Route 4, a bus route in Hong Kong London Buses route 4 in London, United Kingdom Line 4 (Madrid Metro) in Madrid, Spain Line 4 Yellow (Montreal Metro) in Montreal, Canada 4 (New York City Subway service), a subway line in New York City, United States Shanghai Metro Line 4 in Shanghai, China

See also Line 4 (disambiguation)