A Line or A-line may refer to:
Transport
- A (New York City Subway service), rapid transit line
- A Line (Los Angeles Metro), a light rail line in Los Angeles County, California
- A Line (RTD), commuter rail line between Denver and Aurora, Colorado
- Atlantic Coast Line Railroad, rail line in Florida
- Metro A Line (Minnesota), a bus rapid transit line in Minneapolis, Saint Paul, and Roseville, Minnesota
- A-Line (Hamilton), planned rapid transit line in Hamilton, Ontario, Canada
- RapidRide A Line, bus route in King County, Washington
- Line A (Buenos Aires Underground), Argentina
- RER A, commuter rail line in Paris, France
- A (Los Angeles Railway), former streetcar service
Other uses
- A-line (clothing), a style of skirt or dress
- Arterial line, a thin catheter inserted into an artery
- A-line - a finding in medical ultrasound of the lung
See also
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