| Abbreviation | Definition |
|---|---|
| HRAN | Hispanic Radio Amateur Network |
| HRiTP | Ham Radio in the Park |
| HS | Highly Sensitive |
| HT | Hand Transceiver |
| I | Ampere |
| IARS | Illawarra Amateur Radio Society |
| ICARS | Iredell County Amateur Radio Society |
| ICB | Intercontinental Correspondence Band |
| ICRC | Insurance City Repeater Club |
| ICW | Interrupted Continuous Wave |
| IFT | Intermediate Frequency Transformer |
| IG | Isolated Ground |
| ILDA | Impedance-Loaded Dipole Antenna |
| IM | Individually Modulated |
| IM | Intermediate Modulation |
| IMBE | Improved Multi-Band Excitation |
| IPA | International Phonetic Alphabet |
| IRC | Internet Relay Chat |
| ISB | Intermediate SideBand |
| ISM | Industrial, Scientific, and Medical radio band |