Blue Line or Blueline may refer to:

Transportation

Asia

China

* Line 2 (Beijing Subway), Beijing, China * Island line (MTR), Hong Kong, China

India

* Blue Line (Namma Metro), Bengaluru, India * Blue Line (Chennai Metro), Chennai, India * Blue Line (Delhi Metro), Delhi, India * Blue Line (Hyderabad Metro), Hyderabad, India * Blue Line (Kolkata Metro), Kolkata, India * Blue Line (Lucknow Metro), Lucknow, India * Blue Line (Nagpur Metro), Nagpur, India

South Korea

* Busan Metro Line 4, Busan, South Korea * Seoul Subway Line 1, Dark Blue Line, Seoul, South Korea * Seoul Subway Line 4, Light Blue Line, Seoul, South Korea

Taiwan

* Blue Line (Taichung Metro), Taichung, Taiwan * Bannan line, Taipei, Taiwan

Others

* Blue Line (Bangkok), Bangkok, Thailand * Blue Line (Dubai Metro), Dubai * Cikarang Line of KRL Commuterline, Jakarta, Indonesia *

Manila Light Rail Transit System Line 2 The Light Rail Transit Line 2, also known as LRT Line 2, LRT-2, or Megatren, is a rapid transit line in Metro Manila in the Philippines owned and operated by the Light Rail Transit Authority (LRTA). The line generally runs in an east–west di ...

, Manila, Philippines * Line 1 (Riyadh Metro), Blue Line, Riyadh, Saudi Arabia * Downtown MRT line, Singapore * Yokohama Municipal Subway Blue Line, also called Lines 1 & 3, Yokohama, Japan

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 Métro 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

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 * Blue Line (Calgary), Calgary, Alberta, Canada * 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 * A Line (Los Angeles Metro), Los Angeles County, California * Blue Line (Mexico City Metro), Mexico * Blue Line (Mexico City Metrobús), Mexico * Metro Blue Line (Minnesota), Minneapolis, Minnesota * Blue Line (Montreal Metro), Montreal, Quebec * 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 * Blue Line (SacRT), Sacramento, California * Blue Line (San Diego Trolley), San Diego, California * Blue Line (BART), San Francisco Bay Area, California *

N Judah The N Judah is a hybrid light rail/streetcar line of the Muni Metro system in San Francisco, California. The line is named after Judah Street that it runs along for much of its length, named after railroad engineer Theodore Judah. It links down ...

, a Muni Metro light rail line in San Francisco, California * Line 3 Scarborough, Toronto, Canada * Viva Blue, York Region, Ontario * 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 * Line 4 (O-Train), the Airport Link of Ottawa's O-Train (Line 4)

South America

* Line 1 (São Paulo Metro), São Paulo, Brazil

Africa

* Blue Line (Lagos Transit), Lagos, Nigeria * Blue Line, part of the Abuja Light Rail Network in Abuja Nigeria

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 A stream is a continuous body of water, body of surface water Current (stream), flowing within the stream bed, bed and bank (geography), banks of a channel (geography), channel. Depending on its location or certain characteristics, a strea ...

, 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'' {{Color lines (dab), additional= * Blue belt (disambiguation) * Blue Route (disambiguation) * Blue Star Line, a shipping line * Blue Train (disambiguation) * Long Blue Line (disambiguation) * The Thin Blue Line (disambiguation) * {{look from