OB
OB, O.B., or Ob may refer to:
Arts and entertainment
- Ob, a fictional currency in The Great Explosion
 - Sam "O.B." O'Brien, a fictional character in the British soap opera Hollyoaks
 
Businesses and organizations
- Odense Boldklub, a Danish football club
 - Oriental Brewery, a South Korean brewery, which produces the OB lagers
 - Outward Bound, an international outdoor education organization
 - Astrakhan Airlines (IATA code) (defunct)
 - Boliviana de Aviación (IATA code)
 
People
- Ed O'Bradovich, an American former professional football player, known as "OB"
 - 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
 
Places
- Gulf of Ob, a bay of the Arctic Ocean in Northern Russia
 - Ob (river), a river in West Siberia, Russia 
- Ob Sea, an artificial lake on the river Ob
 
 - Ob, Germany, in Bidingen, Bavaria, Germany
 - Ob, Russia, a town in Novosibirsk Oblast, Russia
 - Ocean Beach, San Diego, a neighborhood of San Diego, California, United States
 
Science and technology
- OB star, in astronomy, a hot, massive star of spectral types O or B
 - Ob, a class of objects in category theory
 - Object Manager (Windows), a Windows NT subsystem
 - Obstetrics, a medical specialty dealing with childbirth, often used in "obstetrics and gynaecology" (abbreviated OB/GYN)
 - Oligonucleotide/Oligosaccharide DNA-Binding-fold domain
 - Organizational behavior, an academic field
 - Outside broadcasting, a television broadcasting from a mobile television studio, such as a van
 
Other uses
- Halfpenny (British pre-decimal coin), from "ob", archaic abbreviation
 - ob., died, from Latin obitus
 - o.b. (brand), a brand of feminine hygiene products
 - Order of battle
 - Order of Burma
 - Organizational behavior
 - "Over-the-counter bulletin board", in stock listings
 - Ouroboros (Marvel Cinematic Universe), aka "O.B.", a character in the TV series Loki
 - "Out of bounds", an area outside the course play area, in golf
 
See also
- Obese Records, a former Australian record label, founded as a record store in Melbourne called O.B.'s
 - Obi (disambiguation)
 - Obie (disambiguation)
 - OOB (disambiguation)
 - Old Babylonian (disambiguation)