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OBS
Coop Obs!
OBS (South Korean broadcaster)
OBSS (disambiguation)
Obstetrics and gynaecology
Ocean-bottom seismometer
Océ
Off-balance-sheet
Office of Boating Safety
Oita Broadcasting System
Olympic Broadcasting Services
On Basilisk Station
One Buck Short
Open Broadcaster Software
Open Build Service
Operation Blue Star
Oporto British School
Optical burst switching
Optus Broadband Satellite
Orange Belt Stages
Orange Blossom Special (song)
Orange Business Services
Organic brain syndrome
Organisation breakdown structure
Organization for Black Struggle
Outward Bound
Outward Bound Singapore
VHF omnidirectional range
bullhead rail