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