A-line or A Line may refer to:
- A (New York City Subway service), rapid transit line in New York City, USA
- A Line (RTD), commuter rail line serving Denver and Aurora, Colorado, USA
- A-Line (Hamilton), planned rapid transit line in Hamilton, Ontario, Canada
- Metro A Line (Minnesota), a bus rapid transit line in Minneapolis, Saint Paul, and Roseville, Minnesota, USA
- RapidRide A Line, bus route in King County, Washington, USA
- RER A, commuter rail line in Paris, France
|This disambiguation page lists articles associated with the title A-line.
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