HB

HB is an abbreviation of:

Hampton and Branchville Railroad Template:Reporting mark
Hanna Barbera, cartoon makers, precursors of Cartoon Network Studios
hard black – a medium grade of pencil lead
Helvetischer Bund, used as ICAO aircraft registration prefix (since 1935, before: CH) for Switzerland
Hurry Back - Internet Slang
Hemoglobin is often abbreviated as Hb
HB ice cream in Ireland, originally an abbreviation for Hughes Brothers' Dairy, Rathfarnham, now produced by Unilever and part of the Heartbrand.
Helbreath, a popular PvP MMORPG.
Brinell hardness
Hofbräu, a German brewery
Huntington Beach, a growing coastal town in Southern California
Havnar Bóltfelag, football team in the Faroe Islands