| Acronym | Meaning |
| GAP | Commission on Government Accountability to the People (Florida) |
| GAP | General Area Plot |
| GAP | General Aviation Propulsion |
| GAP | Generalized Availability Program (satellite communications availability calculation tool) |
| GAP | German-American Partnership |
| GAP | Global Asset Positioning |
| GAP | Glock Automatic Pistol |
| GAP | Golden Age Pass (various locations) |
| GAP | Government Accountability Program |
| GAP | Government Accountability Project |
| GAP | Government Action Plan (Australia) |
| GAP | Graffiti Abatement Program (various locations) |
| GAP | Grand Army Plaza (New York) |
| GAP | Gridded Airfield Photograph |
| GAP | Growth and Puberty Study (Chronic Disease Epidemiology Group; US NIH) |
| GAP | Guaranteed Access Plan |
| GAP | Guidance Application Program |
| GAP | Guided Assessment Process (various locations) |
| GAP | Gully Assessment Procedure |
| GAP | Gun-Fired Antitank Projectile |
| GAP | Guyana Action Party |
| GAP | Proletarian Action Group (Martinique) |