BC most often refers to:

• Before Christ, a calendar era based on the traditionally reckoned year of the birth of Jesus of Nazareth
• British Columbia, the westernmost province of Canada
• Baja California, a state of Mexico

BC may also refer to:

• "B.C.", a song by Sparks from the 1974 album Propaganda
• B.C. (comic strip) by Johnny Hart, and one of its characters
• BC (video game) by Lionhead Studios
• BC The Archaeology of the Bible Lands, a BBC television series
• Bullet Club, a professional wrestling stable

• Basilian Chouerite Order of Saint John the Baptist, an order of the Greek Catholic Church
• BC Card, a Korean credit card company
• Bella Center, a conference center in Copenhagen, Denmark
• Brasseries du Cameroun, a brewery in Cameroon (also known as SABC)
• Brunswick Corporation (NYSE ticker symbol BC)

• Bakersfield College, a college in Bakersfield, California
• Bellevue College, a college in Bellevue, Washington
• Benedictine College, a college in Atchison, Kansas
• Benedictine Military School, a high school in Savannah, Georgia
• Bergen Catholic High School, a high school in Oradell, New Jersey
• Boston College, a university in Chestnut Hill, Massachusetts
  • Boston College Eagles, its athletic teams
• Brazosport College, a college in Lake Jackson, Texas
• Broward College, a college in Fort Lauderdale, Florida
• Brooklyn College, a college in Brooklyn, New York

• Baccalaureus or bc, a Bachelor's degree in the Netherlands
• Baghdad College, a high school in Baghdad, Iraq
• British Council

• Backcrossing, a crossing of a hybrid with one of its parents, or a genetically similar individual
• Backward compatibility, the ability of new software to work similarly to its predecessor
• Ballistic coefficient, a measure of air drag on a projectile
• Base curve radius, a parameter of a contact lens
• Battle command, a military discipline
• Bayonet cap, a standard light bulb connection
• bc (programming language), an arbitrary-precision calculator language
• Black carbon, a carbonaceous component of soot
• Bliss bibliographic classification, a library cataloguing system
• × Brassocattleya or Bc., an orchid genus
• Buoyancy compensator (diving), a piece of scuba diving equipment

• NZR B^C class, a type of steam locomotive
• Skymark Airlines (IATA airline code BC)

• Bullcrap, a phrase denoting something worthless
• "B.C.", nickname of Burr Chamberlain (1877–1933), American football player and coach
• Baguio, a city in the Philippines, locally abbreviated as "B.C."
• BC Powder, a brand of pain reliever
• BookCrossing, a website that encourages leaving books in public places to be found by others
• Botswana, WMO country code (and obsolete NATO and FIPS country codes)

• BC Cygni, a red supergiant star that is one of the largest stars
• Belaruskaja Čyhunka (BCh), the national railway company of Belarus
• Blind carbon copy (Bcc:), the practice of sending an e-mail to multiple recipients without disclosing the complete list of recipients