| 1 | HK | Four Star Aviation | ICAO: FSC, Callsign: Four Star, IATA Prefix: 861, Designator HK reinstated by IATA | VI | AVCODES |
| 2 | HK | Yangon Airways Limited | ICAO: AYG, Callsign: Air Yangon, IATA designator changed to YH w.e.f. 15 June 2009. | MYA | AVCODES |
| 3 | HK | Compagnie Generale Aerienne Africaine | Callsign: Cogeair, | ZAR | AVCODES |
| 4 | HK | Helikopter Service A/S | ICAO: HKS, Callsign: Helibus, | N | AVCODES |
| 5 | HK | Turkuaz Airlines | ICAO: TRK, Desinator HK* recalled by IATA | TR | AVCODES |
| 6 | HK | Hamburg Airways Luftverkehrsgesellschaft mbH | ICAO: HAY, Callsign: Hamburg Airways, | D | AVCODES |
| 7 | HK | Skippers Aviation Pty Ltd. | Designator JW* recalled by IATA | AUS | AVCODES |
| 8 | HK | Noble Air | ICAO: NAD, Callsign: Nobleair, Ceased opeations at the end of 1991. | TR | AVCODES |
| 9 | HK | other transit systems | City: Hong Kong | HK | TRAFFIC |
| 10 | HK | Hans Kaiser GmbH & Co KG | | DE | VKM |
| 11 | HKA | Superior Aviation, Inc. | Callsign: Spend Air, Designator SO recalled by IATA. IATA designator changed from AB* | USA | AVCODES |
| 12 | HKA | Superior Aviation, Inc. | IATA: AB, Callsign: Spend Air, IATA designator changed to SO | USA | AVCODES |
| 13 | HKA | Superior Aviation, Inc. | IATA: SO, Callsign: Spend Air, Designator SO recalled by IATA. IATA designator changed from AB* | USA | AVCODES |
| 14 | HKA | Superior Aviation | IATA: SO | | ICAO1 |
| 15 | HKAG | Hastag Kies AG | | CH | TRAFFIC |
| 16 | HKAG | Hastag Kies AG | | CH | VKM |
| 17 | HKAM | HOUCKS FUEL OIL CO INC | | | SCAC4 |
| 18 | HKB | Hawker Beechcraft Corporation | Callsign: Classic, | USA | AVCODES |
| 19 | HKB | Hersfelder Kreisbahn | | D | TRAFFIC |
| 20 | HKB | Museumseisenbahn Hümmlinger Kreisbahn e.V. | | DE | VKM |
| 21 | HKBAU | Hieden & Kall Hoch- und Tiefbaugesellschaft mbH | | AT | VKM |
| 22 | HKBH | HAINES & KIBBLEHOUSE INC | | | SCAC4 |
| 23 | HKBN | HERITAGE OAKS FARM TRANSPORTATION S | | | SCAC4 |
| 24 | HKC | Hong Kong Air Cargo Co., Ltd. | IATA: RH, Callsign: Mascot, IATA Prefix: 828, | PRC | AVCODES |
| 25 | HKCB | HERB FRENCH TRUCKING | | | SCAC4 |
| 26 | HKCB | Citybus Limited | | HK | TRAFFIC |
| 27 | HKCF | Hong Kong Cityflyer | | HK | TRAFFIC |
| 28 | HKCI | HOUTX TRUCKING INC | | | SCAC4 |
| 29 | HKCM | HIKINGCAMPING.C | | | SCAC4 |
| 30 | HKCT | HENNER TANK LINES INC | | | SCAC4 |
| 31 | HKCV | HAWKINS COVE OIL SUPPLY CORP | | | SCAC4 |
| 32 | HKDA | HREBENIUK, DARCY | | | SCAC4 |
| 33 | HKDI | HECKLER & KOCH DEFENSE INC | | | SCAC4 |
| 34 | HKE | Hong Kong Express Airways Ltd | IATA: UO, Callsign: Hongkong Shuttle, | HK | AVCODES |
| 35 | HKE | Hong Kong Express Airways | IATA: UO | | ICAO1 |
| 36 | HKE | Hong Kong Express | | HK | TRAFFIC |
| 37 | HKEC | HORSTMEIER TRUCKING LLC | | | SCAC4 |
| 38 | HKEI | HAAS, KEITH ENTERPRISES INC | | | SCAC4 |
| 39 | HKEN | HOCKENBARY, J & J | | | SCAC4 |
| 40 | HKEP | HAWKS EXPRESS INC | | | SCAC4 |
| 41 | HKEQ | HASKIN, STEVE TRUCKING | | | SCAC4 |
| 42 | HKEV | HARVICK, KEVIN INC | | | SCAC4 |
| 43 | HKEY | HACKER BOAT COMPANY INC | | | SCAC4 |
| 44 | HKFI | HIS KINGDOM FREIGHT INC | | | SCAC4 |
| 45 | HKFL | HUSKY FLOORING (DIV OF | | | SCAC4 |
| 46 | HKG | Government Flying Service of Hong Kong Special Administrative Region | Callsign: Hongkong Government, | HK | AVCODES |
| 47 | HKG | Government Flying Service | | | ICAO1 |
| 48 | HKGC | HOOK GRAIN CORP | | | SCAC4 |
| 49 | HKGFS | Hong Kong Government Flying Service | Real: GFS | HK | TRAFFIC |
| 50 | HKGI | HOLTHAUS TRUCKING INC | | | SCAC4 |
| 51 | HKGU | HONG KONG ISLANDS LINE | | | PWRC |
| 52 | HKGU | Hong Kong Islands Line | | | RSRV |
| 53 | HKGX | Haines & Kibblehouse, Inc. | 7/2005 (not listed) | | NAKINA |
| 54 | HKGX | HAINES & KIBBLEHOUSE, INC. | | | PWRC |
| 55 | HKGX | Haines & Kibblehouse Inc. (The H&K Group) | | | RSRV |
| 56 | HKGX | HAINES & KIBBLEHOUSE INC | | | SCAC4 |
| 57 | HKGX | Haines & Kibblehouse Inc | | USA | TRAFFIC |
| 58 | HKH | Air-Invest Ltd | Callsign: Hawkhungary, | H | AVCODES |
| 59 | HKH | Air-Invest | | | ICAO1 |
| 60 | HKHA | Hong Kong Hospital Authority | | HK | TRAFFIC |
| 61 | HKHU | HONG-KUANG HI TECH, CORP | | RC | BIC |
| 62 | HKHUV | Klostermann Baugesellschaft GmbH | | DE | VKM |
| 63 | HKI | Wachovia Flight Operations d/b/a Hawkaire | Callsign: Hawkeye, | USA | AVCODES |
| 64 | HKI | Hawkaire | | | ICAO1 |
| 65 | HKIN | HOLLISTER TRUCKING INC | | | SCAC4 |
| 66 | HKIR | HILLS TRUCKING INC | | | SCAC4 |
| 67 | HKIS | HONG KONG ISLANDS LINE | | | PWRC |
| 68 | HKIU | HONG KONG ISLANDS LINE | | | PWRC |
| 69 | HKIU | Hong Kong Islands Line | | | RSRV |
| 70 | HKJ | Hong Kong Airlines Corporate Jet Management Ltd | | PRC | AVCODES |
| 71 | HKJ | Hästveda - Karpalund Järnväg | 1886 - 1898 | S | svenska-lok.se |
| 72 | HKJF | HARVEL, K & J FARMS | | | SCAC4 |
| 73 | HKJL | HARKNESS, JIM EQUIPMENT LTD | | | SCAC4 |
| 74 | HKJT | HACKLE, JERRY TRUCKING | | | SCAC4 |
| 75 | HKKL | HICKS TRUCKING II LLC | | | SCAC4 |
| 76 | HKL | Hak Air Limited | Callsign: Hak Airline, | WAN | AVCODES |
| 77 | HKL | Hak Air | | | ICAO1 |
| 78 | HKLC | HOKER LOGISTICS LLC | | | SCAC4 |
| 79 | HKLG | H & K LOGISTICS LLC | | | SCAC4 |
| 80 | HKLI | HWY-KING LOGISTICS INC | | | SCAC4 |
| 81 | HKLS | HERRING, KEN L & SON INC | | | SCAC4 |
| 82 | HKMD | HAWKEYE MOVERS OF DAVENPORT INC | | | SCAC4 |
| 83 | HKMI | HENKELS & MCCOY INC | | | SCAC4 |
| 84 | HKMTR | MTR Corporation | | HK | TRAFFIC |
| 85 | HKMW | HONG KONG MING WAH SHIPPING COMPANY | | | SCAC4 |
| 86 | HKN | Jim Hankins Air Service, Inc. | Callsign: Hankins, | USA | AVCODES |
| 87 | HKN | Jim Hankins Air Service | | | ICAO1 |
| 88 | HKNANNY | School private bus service | City: Hong Kong | HK | TRAFFIC |
| 89 | HKNI | HIT INC | | | SCAC4 |
| 90 | HKNU | HUBERT KLAESENER JR. FLUESSIGKEISTRANSPORTE GMBH & CO KG | | D | BIC |
| 91 | HKNU | HUBERT KLASENER JR FLUSSIGKEITSTRAN | | | SCAC4 |
| 92 | HKO | Helico ApS | | DK | AVCODES |
| 93 | HKO | Hilton Kommunal GmbH | | DE | VKM |
| 94 | HKOD | HHTANKERS ONE LTD | | | SCAC4 |
| 95 | HKOL | HAWKEYE OIL CO | | | SCAC4 |
| 96 | HKONG | | | | TRAFFIC |
| 97 | HKPE | HOLTKAMP ENTERPRISES | | | SCAC4 |
| 98 | HKPI | HAWK PLASTICS LTD | | | SCAC4 |
| 99 | HKPOL | Hong Kong Police | | HK | TRAFFIC |
| 100 | HKPU | HONG KONG ISLANDS LINE | | | PWRC |
