B Line, B-Line or Line B may refer to the following:

Transportation United States B (AC Transit), a bus route in the San Francisco Bay Area, California B (Los Angeles Railway), former streetcar service in Los Angeles, California B (New York City Subway service), a subway route in New York City, New York B (SEPTA Metro), a subway line in Philadelphia, Pennsylvania B Line (Los Angeles Metro), a rapid transit line in Los Angeles County, California B-Line (Norfolk Southern), a freight-rail line in Virginia B Line (RTD), a light-rail system in Denver, Colorado B Line (Valley Metro), a light rail line in Phoenix, Arizona Metro B Line (Minnesota), a rapid bus line in Minneapolis-Saint Paul, Minnesota Riverview Corridor, previously known as the B Line RapidRide B Line, a bus route in King County, Washington Green Line B branch, a light-rail line in Boston, Massachusetts B-Line Rivalry, a sports rivalry between Boston College and Boston University Butte Regional Transit, a bus system in Butte County, California, branded as "B-Line"

Elsewhere Line B (Buenos Aires Underground), an rapid transit line in Buenos Aires, Argentina B-Line (Hamilton), a proposed light-rail line in Hamilton, Ontario, Canada Line B (Prague Metro), a rapid transit line in Prague, Czech Republic Line B (Rennes Metro), a rapid transit line in Rennes, France Line B (Rome Metro), a rapid transit line in Rome, Italy B-Line (Sydney), a bus rapid transit system in Sydney, Australia B-Line (Vancouver), a bus rapid transit system in Vancouver, British Columbia, Canada Mexico City Metro Line B, a rapid transit line in Mexico

Other uses "B Line" (song), a track on Lamb's album Fear of Fours The Eighties Matchbox B-Line Disaster, an English rock band Index register, in computing, per outdated British use A finding in lung ultrasound

See also Bee line (disambiguation) B Train (disambiguation)

ru:B (маршрут метро)