BCG can stand for:
- Medicine
- Bacillus Calmette-Guérin, a vaccine for tuberculosis
- Ballistocardiography, a vital sign caused by the mechanical movement of the heart which can be recorded from the surface of the body
- Business
- The Boston Consulting Group, an international management consulting firm
- Astronomy
- Brightest cluster galaxy, the brightest and most massive galaxies in the universe
- Blue Compact Galaxy, a type of low mass starburst galaxy
- Chemistry
- Bromocresol green
- Other
- Bandaranayaka college gampaha
- Berkeley Cinema Group
- Billy Gillispie, American basketball coach
- Birth Control Glasses, a dysphemism given to eyeglasses issued by the American military to its service members
- Board for Certification of Genealogists
- The British Comedy Guide
- Broadband Content Guide