Blue Line or Blueline may refer to:
Transportation Africa
Blue Line (Lagos Transit), Lagos, Nigeria Blue Line, part of the Abuja Light Rail Network in Abuja, Nigeria
Asia China Line 2 (Beijing Subway), Beijing East Rail line, Hong Kong Island line (MTR), Hong Kong
India Blue Line (Namma Metro), Bengaluru Blue Line (Chennai Metro), Chennai Blue Line (Delhi Metro), Delhi Blue Line (Hyderabad Metro), Hyderabad Blue Line (Kolkata Metro), Kolkata Blue Line (Lucknow Metro), Lucknow Blue Line (Mumbai Metro), Mumbai
South Korea Busan Metro Line 4, Busan Seoul Subway Line 1, Dark Blue Line, Seoul Seoul Subway Line 4, Light Blue Line, Seoul
Taiwan Blue line (Taichung MRT), Taichung Bannan line, Taipei
Others Blue Line (Bangkok), Bangkok, Thailand Blue Line (Dubai Metro), Dubai Cibubur Line of Jabodebek LRT, Jakarta, Indonesia MRT Line 3 (Metro Manila), known as Blue Line before 2012, Manila, Philippines Line 1 (Riyadh Metro), Blue Line, Riyadh, Saudi Arabia Downtown Line, Singapore Blue Line (Yokohama), also called Lines 1 & 3, Yokohama, Japan Blue Line (Jerusalem Light Rail)
Europe Blue Line (airline), based in France Blue Line (Lisbon Metro), Portugal Blue Line (Stockholm Metro), Sweden Blue Line International, a former ferry service in the Adriatic Sea Barcelona Metro line 5, often called "Línia Blava" (Blue Line), Barcelona, Spain Barcelona Metro line 6, Barcelona, Spain Paris Metro Line 2, Paris, France Piccadilly line, London, England Sheffield Supertram Blue Line, United Kingdom Tyne and Wear Metro of Newcastle upon Tyne, UK (Former line) Victoria line, London, England
North America
Canada Blue Line (Calgary), Calgary, Alberta Blue Line (Montreal Metro), Montreal, Quebec Line 4 (O-Train), the Airport Link of Ottawa's O-Train (Line 4) Line 3 Scarborough, Toronto, Ontario Viva Blue, York Region, Ontario
Mexico Blue Line (Mexico City Metro) Blue Line (Mexico City Metrobús)
United States
California A Line (Los Angeles Metro), Los Angeles County Blue Line (SacRT), Sacramento Blue Line (San Diego Trolley), San Diego Blue Line (BART), San Francisco Bay Area N Judah, a Muni Metro light rail line in San Francisco
New York City The Harlem Line of the Metro-North Railroad The Hoboken–33rd Street route of the PATH Train Any of the New York City Subway services that use the IND Eighth Avenue Line and its branches: A Eighth Avenue Express C Eighth Avenue Local E Eighth Avenue Local The former K Eighth Avenue Local The Rockaway Park Shuttle, which formerly contained a blue route bullet The Port Jefferson Branch of the Long Island Rail Road The former JFK Express of the New York City Subway The future T Second Avenue Local of the New York City Subway The West Hempstead Branch of the Long Island Rail Road The Staten Island Railway
Other ARTx Blue Line, formerly Rapid Ride, Albuquerque, New Mexico Blue Line (MARTA), Atlanta, Georgia Blue Line (CapMetro), Austin, Texas Blue Line (MBTA), Boston, Massachusetts Lynx Blue Line, Charlotte, North Carolina Blue Line (CTA), Chicago, Illinois Blue Line (RTA Rapid Transit) (light rail), Cleveland, Ohio Blue Line (DART), Dallas, Texas Trinity Railway Express, Dallas, Texas H Line (RTD), Denver, Colorado Metro Blue Line (Minnesota), Minneapolis, Minnesota Atlantic City Line, a commuter rail line New Jersey Grove Street – Newark Penn, a light rail line in Newark, New Jersey North Jersey Coast Line, a commuter rail line New Jersey Blue Line (Pittsburgh), Pittsburgh, Pennsylvania Market–Frankford Line, Philadelphia, Pennsylvania MAX Blue Line, Portland, Oregon Blue Line (St. Louis MetroLink), St. Louis, Missouri Blue Line (Sound Transit), a proposed extension in Seattle, Washington Swift Blue Line, Snohomish County, Washington Blue Line (TRAX), a light rail line in the Salt Lake City, Utah area Blue Line (Washington Metro), Washington, DC Tomorrowland Transit Authority PeopleMover, Walt Disney World, Florida
Oceania Eastern Suburbs & Illawarra Line, Sydney, Australia Leppington & Inner West Line, Sydney, Australia South Coast Line, New South Wales, Australia
South America Line 1 (São Paulo Metro), São Paulo, Brazil
Other Blue Line (album), by Yae Blue line (ice hockey), the line between center ice and each team's zone Blue Line (withdrawal line), the UN drawn demarcation line dividing Lebanon from Israel and the Golan Heights Blue Line (New York State), delineates the Adirondack and Catskill parks of New York's Forest Preserve BlueLine Grid, a mobile communications platform that connects civil service employees Blueline, a 2019 EP by twlv The "blue line", mark on an airspeed indicator for a multi-engine aircraft The blue-line printing process for copying using the diazo chemical process, also known as whiteprint The Blueline Blaster, nickname of Hy Buller (1926–1968), All Star NHL ice hockey player Blue line, a diagram in method ringing which shows the structure of a method Blue-line stream, year-round streams that are typically denoted on maps with solid blue lines "Blue Lines", a song by the American band Bright from the album Full Negative (or) Breaks