ORS

• Ocean Rowing Society
• Oculo-respiratory Syndrome
• Office of Rehabilitation Services
• Office of Recovery Services
• Office of Retirement Services
• Old Red Sandstone
• Olfactory Reference Syndrome
• Omnificent Role-playing System
• Oneida Research Services
• Online Radio System
• Online Resource Scheduler
• Operational Research Section of RAF Bomber Command
• The Operationally Responsive Space Office within the United States Department of Defense
• Oral rehydration salt or oral rehydration solution
• The IATA airport code for Orcas Island Airport in Eastsound, Washington
• Ordered Recovery Systems, LLC
• Oregon Revised Statutes
• Organic-Rich Shales
• Orlando Riva Sound
• Orthopaedic Research Society
• Output Record Separator
• Ovarian Remnant Syndrome
• Overseas Research Scholarship
• Overseas Research Student
• Optical Response Sheet

Ors

• For the French commune, see Ors.
• Ors, an abbreviation for "Others"