OB

OB may refer to:

OB star, in astronomy, a hot, massive star of spectral types O or B
Ocean Beach, San Diego, a neighborhood of San Diego, California, United States
Odense Boldklub, a Danish football club
Old Badmintonians, former pupils of Badminton School, Bristol, England
Old Bedfordians, former pupils of Bedford School, England
Old Bristolians, former pupils of Bristol Grammar School, England
Organizational behaviour, an academic field of study
Oriental Brewery, a South Korean brewery, which produces the OB lagers
Outside broadcasting, a television broadcasting from a mobile television studio, such as a van
Outward Bound, an international outdoor education organization
Astrakhan Airlines IATA code
Boliviana de Aviación IATA code
OB (cartoon), a comic strip by Burton Silver

People known by the initials

Sam "O.B." O'Brien, a fictional character in the British soap opera Hollyoaks
Ed O'Bradovich, a former Chicago Bears defensive lineman and current Bears postgame host on 670 the Score