| H | High Level (Chart designator) |
| H+ | Minutes past the full Hour |
| H24 | Continuous Day and Night Services |
| HAA | Height Above Aerodrome |
| HAS | Height above Site |
| HAT | Height Above Touchdown Zone Elevation |
| HBN | Hazard Beacon |
| HC | Critical Height |
| HDF | High Frequency Direction Finding Station |
| HDG | Heading |
| HEL | Helicopter |
| HF | High Frequency (3 000 - 30 000 kHz) |
| HGT | Height/Height above |
| HH+ | All Synoptic Hours: 0000: 03001 0600 etc. |
| HI | High (altitude) |
| HI | High Intensity (lights) |
| HIAL | High Intensity Approach Lights |
| HIALS | High Intensity Approach Light System |
| HIRCLL | High Intensity Runway Centre Line Lights |
| HIRL | High Intensity Runway Lights |
| HIWAS | Hazardous In-flight Weather Advisory Service |
| HJ | Sunrise to Sunset-Day Service |
| HJ+ | Sunrise to.... Minutes after Sunset |
| HL | High Level |
| H-L | Combined High/Low Level Chart |
| HLDG | Holding |
| HN | Sunset to Sunrise-Night Service |
| HN+ | Sunset to.... Minutes before Sunrise |
| HO | Service available to meet Operational Requirements |
| HOL | Holiday |
| HOSP | Hospital |
| hPa | Hectopascal |
| HQ | Headquarters |
| HR | Hour(s) |
| HS | Service available during Hours of Scheduled Operations |
| HSI | Horizontal Situation Indicator |
| HST | High Speed Taxiway Turn-off |
| HTZ | Helicopter Traffic Zone |
| HVY | Heavy |
| HX | No Specified Working Hours |
| Hz | Hertz |
