| Abbreviation | Definition |
|---|---|
| INT | I'll Never Tell |
| INT | Interested |
| INTL | It's Never Too Late |
| INTL | It's Never Too Late. |
| INTS | I Need To Sleep |
| INU | I Need You |
| INUCOSM | It's No Use Crying Over Spilt Milk |
| INV | Invite |
| INW | I Never Will |
| INWO | It's Not Working Out |
| INYO | I Need Your Opinion |
| IO | Intellect Optional |
| IOC | I'm Obviously Corrupt |
| IOCN | International Organization of Chaz the Namesake |
| IOHO | In Our Humble Opinion |
| IOI | I'm Over It |
| IOIYAR | It's Okay If You're A Republican |
| IOKWIKN | I Only Know What I Know Now |
| IOL | Image Of Life |
| IOLO | I Only Live Once |