OBS
OBS or obs. may refer to:

Organisations
 Office of Boating Safety, the division of Transport Canada responsible for boating safety
 Optus Broadband Satellite, a satellite broadband service offered by the Australian ISP Optus
 Orange Belt Stages, a bus company based in California, US
 Orange Business Services, a worldwide business communications company
 Organization for Black Struggle, an activist organization in St. Louis, Missouri, US 
 Coop Obs!, a chain of hypermarkets in Norway, formerly known as Obs
 Outward Bound School; See Outward Bound
 Outward Bound Singapore, part of the network of Outward Bound centres
 Océ Business Services, the outsourcing business of Océ
 Oporto British School, a school in northern Portugal

Science and technology
 Organic brain syndrome, a medical condition resulting from brain injury
 Omnidirectional bearing selector, an aircraft navigation instrument; See VHF omnidirectional range
 Obstetrics and gynaecology, commonly abbreviated Obs/Gyn
 Ocean-bottom seismometer, a seismic tool to record earthquakes underwater
Old Body Style, a style of GM pickup trucks manufactured between 1988 and 2000

Computing
 Open Broadcaster Software, an open source streaming and recording program
 Open Build Service, a software distribution development platform
 Optical burst switching, a switching technology in optical networks

Television, film, literature, and music
 On Basilisk Station, the first novel in David Weber's Honor Harrington series
 One Buck Short, a punk-rock band from Kuala Lumpur, Malaysia
 "Orange Blossom Special" (song), bluegrass song written by Ervin T. Rouse

Broadcasters
 OBS (South Korean broadcaster), a broadcast television station based in Bucheon, Gyeonggi-do, South Korea
 Oita Broadcasting System, a broadcasting station in Ōita Prefecture, Japan
 Olympic Broadcasting Services, an organization responsible for the broadcast of the Olympic Games since 2010 Vancouver Winter Games

Business
 Off-balance-sheet, financing activity not on the company's balance sheet
 Organisation breakdown structure, a global hierarchy that represents the different levels of responsibility within a project or enterprise

Other uses
 Operation Blue Star
 Original British Standard, a bullhead rail profile

See also
 OBSS (disambiguation)