| Acronym | Definition |
|---|
| ATK | Attack |
| ATK | Accessibility Toolkit (GNOME Accessibility Project) |
| ATK | Above the Knee (medical care) |
| ATK | America's Test Kitchen (TV Show) |
| ATK | Alliant Techsystems Inc. (aerospace and defense company) |
| ATK | All-Terrain Kart (vehicle) |
| ATK | Amtrak |
| ATK | AppleTalk (file extension) |
| ATK | Andrew Toolkit |
| ATK | Accessibility Tool Kit |
| ATK | Attack Tool Kit |
| ATK | Andrew Tool Kit |
| ATK | Anti Terror Kampf (German: Anti-Terror Fight; martial art) |
| ATK | Aboriginal Traditional Knowledge |
| ATK | Akademia Teologii Katolickiej (Polish: Academy of Catholic Theology) |
| ATK | At The Keyboard |
| ATK | Automaattinen Tietojenkäsittely (Finnish: Automatic Data Processing) |
| ATK | All Things Kawaii (personal website) |
| ATK | Agammaglobulinemia Tyrosine Kinase |
| ATK | Aviation Turbine Kerosene (petroleum) |
| ATK | All Things King (band) |
| ATK | Administrata Tatimore e Kosovës (Kosova Tax Administration) |
| ATK | Available Tonne Kilometer (aviation calculation) |
| ATK | AT Kearney, Inc. (consulting firm) |
| ATK | Aircraft Transport Kit |