The letters GBH can stand for: -
Grievous bodily harm, a type of violent crime in English law and the developmental name for the game Grand Theft Auto 2.
Girth at breast height, a standard measurement of the circumference of a tree.
Charged GBH, a British punk rock band often referred to simply as "GBH"
G.B.H., a satirical drama series written by Alan Bleasdale and shown on the British Channel 4 television channel in 1991.
Gordon B. Hinckley, current president of The Church of Jesus Christ of Latter-day Saints
Great blue heron, a wading bird, and a music festival in Sherman, NY, USA.
Great British Hardcore, a wrestling promotion
God Bless Hashish, a famous phrase originating in the South West of England, and name of an album by the band
WGBH, a PBS affiliate in Boston.
G.B.H. & G.B.H. 2- Lethal Impact (independent TV-film production), Gang-warfare action films set in Manchester in 1981 and 1992 respectively.
GHB, when used as a party drug, is occasionally referred to as GBH.
Source:
http://en.wikipedia.org/wiki/GBH