List of public transport routes numbered 3
# List of public transport routes numbered 3

In public transport, Route 3 may refer to:

* Route 3 (MTA Maryland), a bus route in Baltimore, Maryland and its suburbs
* Barcelona Metro line 3
* London Buses route 3
* Line 3 (Madrid Metro)
* Melbourne tram route 3
* 3 (New York City Subway service)
* Seoul Subway Line 3
* Shanghai Metro Line 3
* Southern Vectis route 3, a bus route running between Newport and Ryde on the Isle of Wight
