The Camden Line is a MARC commuter rail line that runs for 39 mi (63 km) between Washington Union Station in Washington, D.C., and Camden Station in Baltimore, Maryland, over the CSX Capital Subdivision and Baltimore Terminal Subdivision.

The Baltimore and Ohio Railroad began running commuter service from Baltimore to Ellicott City over part of the current line's trackage on May 24, 1830, making this corridor one of the country's oldest rail routes still in operation.

As of 2019[update], the Camden Line is a weekday-only service.

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