List of public transport routes numbered 9

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