| Acronym | Meaning |
 | OHSS | Ovarian Hyperstimulation Syndrome |
| LOFAR | Low Frequency Analysis And Recording |
| OB | Obedience - Obligation - Obligatory - Obsolete - Obstetrics -Ocean Beach (California) - Off Break (cricket) - Old Bryanstonian - Order Of Battle - Outlet Box (electrical) -Overbought (stock Market) -Oversight Board |
| IT | Italian Language (ISO 639-1 Code) |
| TIMS | Tactical Internet Management System - The Institute Of Management Sciences - The International Molinological Society - Thermal Infrared Multispectral Scanner - Thermal Ionization Mass Spectrometry - Travel Information Management Services - Tuberculosis In |
| KGO | Knight Of The Guelplic Order Of Hanover |
| LBY | Libya (ISO 3166 Trigram) |
| CPG | Clinical Practice Guideline |
| CGM | Computer Graphics Metafile |
| PBI | PolyBenzImidazole |
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