| Acronym | Definition |
|---|
| FOG | Free Online Games (website) |
| FOG | Form of Government |
| FOG | Father of the Groom |
| FOG | Field Operations Guide |
| FOG | Fit of Giggles |
| FOG | For Our Grandchildren (various organizations) |
| FOG | Fingerprints of the Gods (Graham Hancock book) |
| FOG | Fiber-Optic Gyro |
| FOG | Fear, Obligation & Guilt (psychology) |
| FOG | Festool Owners Group (woodworking forum) |
| FOG | Ford of Germany |
| FOG | Friend of God |
| FOG | Fields of Glory (gaming) |
| FOG | Friend of GATA |
| FOG | Fields of Green (band) |
| FOG | Favor Of God |
| FOG | Focus on God |
| FOG | Fellowship of Gamers |
| FOG | Friends of George (President George W. Bush) |
| FOG | Front Office Group (various organizations) |
| FOG | Followers of God |
| FOG | Fear of Google |
| FOG | Fast Oxidative-Glycolytic |
| FOG | Fats Oils & Greases |
| FOG | Full Outturn Guarantee (cargo insurance) |
| FOG | Fist of Guthix (RuneScape) |
| FOG | Flow Of Gold |
| FOG | Frag of Generation (gaming association) |
| FOG | Friends of Garrapata (California) |
| FOG | Fuel, Oil and Grease |
| FOG | Fiber-Optics Guided |
| FOG | Finger On Glass (military radar user interface) |
| FOG | Frequency of Gobbledygook |
| FOG | Forums Operative Gynäkologie |
| FOG | Foreign Operating Group (espionage) |
| FOG | Filter, Oil, and Grease |
| FOG | Flexible Overhead Gantry (US aerospace) |
| FOG | Flat Over Garage (UK rentals) |
| FOG | Flat Out Guess |
| FOG | Frigging Opportunity for Growth (polite form) |
| FOG | Fondo de Oportunidades Globales (Spanish) |
| FOG | Free On Ground (transportation) |