| Acronym | Definition |
|---|
| IK | I Know |
| IK | Indigenous Knowledge |
| IK | Inverse Kinematics (rule of physics) |
| IK | Idrottsklubb (Sweden) |
| IK | Interstitial Keratitis (corneal scarring) |
| IK | Installation Kit |
| IK | Israel Kamakawiwo'ole (musician) |
| IK | Immortal King (gaming) |
| IK | Instant Kill (game) |
| IK | Invisible Kid (movie; Metallica song) |
| IK | Ilmkreis (Administrative District in Germany) |
| IK | Delayed Rectifier Potassium Current |
| IK | It Knits (knitting website) |
| IK | Idiot King |
| IK | Instrument Kernel |
| IK | Im Kirchendienst |
| IK | Ippatu Kikimusume (anime) |
| IK | Ignis Kinetics (weapons maker) |