| Acronym | Definition |
|---|
| OG➣Offensive Guard (football) |
| OG➣Outgoing |
| OG➣Official Gazette (journal; US Patent and Trademark Office) |
| OG➣Old Glory |
| OG➣Own Goal (soccer) |
| OG➣Officiers de Gendarmerie (French: Police Officers) |
| OG➣Ozzie Guillen (baseball manager) |
| OG➣Organic Gardening Magazine |
| OG➣Oscar Gutierrez (Rey Mysterio's real name) |
| OG➣Operations Group |
| OG➣Oh God |
| OG➣Original Gravity (brewing) |
| OG➣Overground |
| OG➣Olive Green (color of military uniforms, primarily from Korean era) |
| OG➣Obergeschoß (German: Upper Floor) |
| OG➣Olive Garden (restaurant) |
| OG➣Old Guy |
| OG➣Opposite Gender |
| OG➣Olympic Garden (Las Vegas, NV) |
| OG➣Old Gold (cigarette brand) |
| OG➣Overgrow (website) |
| OG➣Original Gangster (rapper) |
| OG➣Old Generation |
| OG➣Orogastric (tube) |
| OG➣Orgrimmar (gaming, World of Warcraft) |
| OG➣Old Growth (forestry) |
| OG➣Original Gamer |
| OG➣Original Gangsta |
| OG➣Original German (Volkswagen collectors' name for original part) |
| OG➣Original Gum |
| OG➣Old Geezer |
| OG➣Organic Growth (company growth) |
| OG➣Omnes Gentes (Latin: All the Peoples, epigraphy) |
| OG➣Oversight Group |
| OG➣Office of the Governor |
| OG➣Original Guardian |
| OG➣Original Ground (construction) |
| OG➣Opera Ghost (The Phantom of the Opera, Sir Andrew Lloyd-Webber) |
| OG➣Octopus Garden (Thorpe Park, Chertsey, UK theme park) |
| OG➣Obergefreiter (German) |
| OG➣Observation Group |
| OG➣Oil & Grease |
| OG➣Operational Guide |
| OG➣Officer of The Guard |
| OG➣Old Greshamian (school alumnia association; UK) |
| OG➣Operation Guidelines |
| OG➣Organized General (song lyric) |
| OG➣Optimal Gaming |
| OG➣Over Guideline |
| OG➣Objective Glass (forward-end lens of a sight or telescope) |
| OG➣Objective Gateway (communications RF gateway) |
| OG➣Orders Group (British Army) |
| OG➣Outer Gimbal |
| OG➣Ogam Irish (linguistics) |
| OG➣Optical Gateway (Alcatel) |
| OG➣Operator Guidelines |
| OG➣Old Glock (gun) |
| OG➣Original Gothamites (Batman) |
| OG➣Inter-College Residents' Association |