| Acronym | Definition |
|---|
| KOS | Knowledge System |
| KOS | Knowledge Organization Structure |
| KOS | Kill on Sight (gaming) |
| KOS | Keepers of Souls (gaming) |
| KOS | Knowledge Organization System |
| KOS | Keeping Ourselves Safe (New Zealand) |
| KOS | Knowledge of Self (song) |
| KOS | Keep on Smiling |
| KOS | Kids Over Shoulder |
| KOS | Kiss on Sight (gaming) |
| KOS | Knights of Solamnia (DragonLance fictional organization) |
| KOS | Kohler Operating System |
| KOS | Kernel Operating System |
| KOS | Key Operated Switch |
| KOS | King of Suicide (gaming) |
| KOS | Key Operated Selector |
| KOS | Knights of Siberys (gaming, Dungeons & Dragons) |