BCG may refer to: Astronomy Blue compact galaxy Brightest cluster galaxy Medicine and biochemistry BCG vaccine (Bacillus Calmette–Guérin), for tuberculosis Ballistocardiography, measuring heart forces Bromocresol green, a dye and pH indicator Companies Beijing Capital Group, China Boston Consulting Group Buffalo Creek and Gauley Railroad (BC&G), Clay County, West Virginia, US Other uses BCG matrix, for product line analysis Billy Gillispie, American basketball coach Bolt carrier group in a firearm British Comedy Guide Big City Greens