ORS

• Collision/reaction cell
• ISO/IEC JTC 1/SC 6
• Michigan Office of Retirement Services
• OID Resolution System
• ORS-1
• ORS-5
• Oculo-respiratory syndrome
• Old Red Sandstone
• Olfactory reference syndrome
• Operational Research
• Operational Research Society
• Operationally Responsive Space Office
• Oral rehydration solution
• Orcas Island Airport
• Oregon Revised Statutes
• Orlando Riva Sound
• Orpheus Island Resort Waterport
• Ors
• Orthopaedic Research Society
• Oulx
• Ovarian remnant syndrome
• Overseas Research Scholarship
• Oxygen reduction system
• SPARK (rocket)
• Shoot 'em up