| HAPS | High Altitude Platform Station |
| HDFS | High Density Fixed Service |
| HDFSS | High Density Fixed-Satellite Service |
| HDTV | High Definition TeleVision |
| HDTP | Hoofddirectie Telecommunicatie en Post van het Ministerie van Verkeer en Waterstaat (NL) |
| HEO | Highly inclined Elliptical Orbit |
| HF | High Frequency (frequency range 3 to 30 MHz) |
| HFBC | High Frequency Broadcasting |
| HIPERLAN | High Performance Local Area Network |
| HLC | High Level Commitee (ITU) |