Line A
Line A may refer to:
- A (Los Angeles Railway), a former streetcar service in California, United States
- A (New York City Subway service), in New York, United States
- Line A (Buenos Aires Underground), in Argentina
- Line A (Prague Metro), in the Czech Republic
- Line A (Rome Metro), in Italy
- Mexico City Metro Line A, in Mexico
- Santiago Metro Line A, a planned line in Chile
- Bilbao tram, in Bilbao, Spain, originally called Line A