| Abbreviation | Definition |
|---|---|
| HRS | Hotel Reservation Service |
| HSG | Heaven Sent Gaming |
| HSHH | HoodshowHiphop |
| HTDOCS | Hypertext Documents |
| HTW | Historical Television Website |
| HU | Halo Underground |
| HW | Hard Workship |
| HWCI | Handle With Care International |
| i2z | Information Inquiry Independan2z |
| IAHB | I Am Happy Blue (website) |
| IANAR | I Am Not A Robot |
| IC | Imperial China |
| IDFB | Elttab Rof Maerd Dnalsi |
| IDW | Indian Defence Wiki |
| IDWG | Intrusion Detection Working Group (IETF) |
| IDYB | Identify Your Breyer |
| IFEP | Infinite Flight Elite Pilots |
| IFOTC | Itchy Feet on the Cheap |
| IGTMR | I Got the Memes Ready |
| IIDRN | Is It Down Right Now? |