| Acronym | Definition |
|---|
| OIS | Office Information System(s) |
| OIS | Optical Image Stabilizer (digital cameras) |
| OIS | Officer Involved Shooting |
| OIS | Office of Information Services (University of Puget Sound) |
| OIS | Overnight Index Swap |
| OIS | Oil States International Inc (stock symbol) |
| OIS | Office of Information Systems |
| OIS | Office of Information Security |
| OIS | Objective Interface Systems, Inc. (Herndon, VA) |
| OIS | Oxygen Isotope Stage (paleoclimatology) |
| OIS | Officer Indoctrination School (US Naval Education and Training Center) |
| OIS | Offer Information Statement (Australian Securities and Investments Commission) |
| OIS | Oh I See |
| OIS | Organization for Internet Safety |
| OIS | Oncology Information System |
| OIS | Object-Oriented Input System |
| OIS | Oregon Intervention System (Oregon Department of Human Services) |
| OIS | Online Information System (Impress Software) |
| OIS | Oxford International School |
| OIS | Objective Instrumentation System (US Army Live Training Transformation) |
| OIS | Orinda Intermediate School (Orinda, CA) |
| OIS | Online Information Services (Impress Software) |
| OIS | Open Interface Specification |
| OIS | Ontologizing Industrial Standards (workshop) |
| OIS | Organization for Internet Security |
| OIS | Obstruction Identification Surface |
| OIS | Ocular Ischemic Syndrome |
| OIS | Operational Intercommunication System |
| OIS | OGE Input Simulator |
| OIS | Osteopathic Information Service |
| OIS | Organization of Indigenous People in Suriname |
| OIS | Office of Internal Security |
| OIS | Offshore Internet Services Limited (St Helier, New Jersey) |
| OIS | OSHA Information System |
| OIS | Orbit Improvement System |
| OIS | Orchard Information Systems (UK) |
| OIS | Oilfield Inspection Services, LLC (Non-destructive testing company, Alberta, Canada) |
| OIS | Overbeek Information Security B.V. |
| OIS | Overflow Internet Services (Gold Coast, Australia) |
| OIS | Ordnance Initiation System |
| OIS | Ordnance Information Sysyen (US Navy) |
| OIS | Open Interface Server |
| OIS | Ohio Innovation Summit |
| OIS | Operator Identification System (AT&T) |
| OIS | Office of International Services (various schools) |
| OIS | Office of Infrastructure Services (Kentucky) |