F Line may refer to:
F (New York City Subway service) F (Los Angeles Railway), a former rail route in Los Angeles, United States F Line (RTD), a light rail line in Denver, United States F (S-train), an urban rail line in Copenhagen, Denmark F Market & Wharves, the historic streetcar line in San Francisco F (AC Transit), a bus route in the San Francisco Bay Area Line F (Buenos Aires Underground) Metro F Line (Minnesota), a planned bus rapid transit line in Minneapolis–Saint Paul, Minnesota, United States RapidRide F Line, a bus route in King County, Washington, United States