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BIA as an that can mean:

• Bureau of Indian Affairs, a U.S. government agency
• Board of Immigration Appeals, a U.S. government agency
• Bastia - Poretta Airport, IATA airport code (BIA), or, informally:
  • Baghdad International Airport (SDA)
  • Bahrain International Airport (BAH)
  • Bengaluru International Airport (BLR)
  • Bangkok International Airport (BKK), officially named 'Suvarnabhumi Airport'
  • Beirut International Airport (BEY)
  • Belfast International Airport (BFS)
  • Bengaluru International Airport (BLR), Bengaluru, India.
  • Blackpool International Airport (BLK)
  • Bangor International Airport (BGR), in Bangor, Maine
  • Bristol International Airport (BRS)
  • Bandaranaike International Airport (CMB)
• Bezbednosno Informativna Agencija, A Serbian intelligence agency
• Bilateral Immunity Agreement, a treaty between the United States and another country
• Burned in [MAC] address
• Italian Albanian Bank, an Albanian bank
• Board of Immigration Appeals, a US immigration appellate court
• Bohemia Interactive Australia, a spin out company of Bohemia Interactive Studio
• Brothers in Arms, a video game
• Bioelectrical impedance analysis is a way to measure body fat with electrical impulses
• Brick Industry Association, formerly the Brick Institute of America
• Business improvement area
• Border and Immigration Agency, a defunct UK government agency
• Burma Independence Army
• Business Impact Analysis

Bia as a word may refer to:

• Bia, a former plant genus now considered synonymous with Tragia (noseburns)
• Bia, Spanish slang term for the name Kenon^{[verification needed]}
• Bia, Meaning "come" in Afghanistan in the Dari language
• Bia, Meaning "come" in Iran in the Farsi language
• Bia, Meaning "come" in Tajikistan in the Tajik language
• bia, the Oriya term for a vagina
• BIA, the iconic force of mythological proportion in Tucson, AZ^{[verification needed]}
• Bia de' Medici
• Bïa, a brazilian-born singer
• Bia (butterfly), a genus of brush-footed butterflies
• Bia language
• Bia (mythology), the mythological figure in Greek mythology
• Bia Mountain (Phou Bia) in Laos
• Bia National Park in Ghana
• Bia River in western Africa
• Bia, Togo
• "Bia Bia", a song by Lil Jon on the edited version of his Kings of Crunk album, titled "Bitch" in the unedited version.