In public transport, Route 9 may refer to:

Spain

Barcelona Metro line 9 Line 9 (Madrid Metro)

United Kingdom

London Buses route 9

United States

9 (New York City Subway service) 9 - Mayfield (Cleveland RTA), a bus route in Cleveland Route 9 (MTA Maryland), a bus route in the suburbs of Baltimore, Maryland

See also Line 9 (disambiguation)