| 1 | HB | Harbor Airlines | ICAO: HAR, Callsign: Harbor, Founded in March 1971, originally named Oak Harbor Airlines. Suspended all flights in May 2001. | USA | AVCODES |
| 2 | HB | Augusta Airways Pty, Ltd. | Designator HB* recalled by IATA | AUS | AVCODES |
| 3 | HB | Homer Air, Inc. | | USA | AVCODES |
| 4 | HB | Direct Air, Inc. | ICAO: DIA, Callsign: Blue sky, Designator HB recalled by IATA | USA | AVCODES |
| 5 | HB | Asia Atlantic Airlines Co., Ltd | ICAO: AAQ, Callsign: Asia Atlantic, IATA Prefix: 943, Designator HB recalled by IATA. Founded in December 2012. Commenced operations on 19 August 2013. Ceased operations on 30 October 2018. | T | AVCODES |
| 6 | HB | Greater Bay Airlines Company Limited | ICAO: HGB, Callsign: Great Bay, | PRC | AVCODES |
| 7 | HB | Hirtshalsbanen | 1925 - 1945 | DK | jernbanen.dk |
| 8 | HB | Hampton & Branchville R.R. Co. | 1/1975-1/1994; eliminated 7/1995; 7/2000-7/2005 | | NAKINA |
| 9 | HB | Hampton & Branchville R.R. Co. | 1/75-1/94; eliminated 7/95; 7/2000 | | NRHS |
| 10 | HB | HAMPTON & BRANCHVILLE RAILROAD COMPANY, INC | | | PWRC |
| 11 | HB | Hampton and Branchville Railroad | | | RSRV |
| 12 | HB | Hirtshalsbanen | 1925 - 1945 | DK | TRAFFIC |
| 13 | HB | Hellertal-Bahn GmbH | | DE | VKM |
| 14 | HB&T | Huntington & Broad Top Mountain R.R. & Coal Co. | Jan-52 | | NRHS |
| 15 | HBA | Trail Lake Flying Service, Inc. d/b/a Harbor Air | Callsign: Harbor Air, | USA | AVCODES |
| 16 | HBA | Trail Lake Flying Service | | | ICAO1 |
| 17 | HBA | Hafenbetrieb Aken GmbH | | DE | VKM |
| 18 | HBAE | HITCHEN, B T TRUCKING | | | SCAC4 |
| 19 | HBAI | H BAR N INC | | | SCAC4 |
| 20 | HBAM | HILDEBRAND, A & M LTD | | | SCAC4 |
| 21 | HBAR | HUBBARD TRANSPORT LLC | | | SCAC4 |
| 22 | HBAU | Hartung-Bau GmbH & Co. KG | | DE | VKM |
| 23 | HBAW | HELICON BU | | | SCAC4 |
| 24 | HBAX | Hirsch Bros. & Co. | 4/1947-4/1961; eliminated 7/1963 | | NAKINA |
| 25 | HBAX | Hirsch Bros. & Co., Inc. | 7/1935 | | NAKINA |
| 26 | HBAX | Hirsch Bros. & Co. | 1/52-4/61; eliminated 7/63 | | NRHS |
| 27 | HBAX | HIRSCH BROS. & CO. | | | PWRC |
| 28 | HBB | Nimbus | | E | AVCODES |
| 29 | HBB | Hansebahn Bremen GmbH | Bremen | D | privat-bahn.de |
| 30 | HBB | | City: Halberstadt | D | TRAFFIC |
| 31 | HBB | Hansebahn Bremen | | DE | VKM |
| 32 | HBBE | HB GLOBAL LOGISTICS LLC | | | SCAC4 |
| 33 | HBBK | HARBOR INTERMODAL TRANSPORT INC | | | SCAC4 |
| 34 | HBBL | HABIB TRUCK LINES | | | SCAC4 |
| 35 | HBBR | HESSELBACHER BROS | | | SCAC1 |
| 36 | HBBU | HABIBA INTERNATIONAL GROUP LIMITED | | HK | BIC |
| 37 | HBC | Haitian Aviation Line, S.A. | Callsign: Halisa, | RH | AVCODES |
| 38 | HBC | Haitian Aviation Line | | | ICAO1 |
| 39 | HBC | HAMM BREWING COMPANY | | | PWRC |
| 40 | HBC | Hamm Brewing Company | | USA | TRAFFIC |
| 41 | HBCA | HARRIS BAKING COMPANY | | | SCAC4 |
| 42 | HBCB | H & B CONSTRUCTION | | | SCAC4 |
| 43 | HBCL | HARBOR CITY OIL CO INC | | | SCAC4 |
| 44 | HBCO | HARRELL, C INC | | | SCAC4 |
| 45 | HBCT | HAPSBURG CORPORATION | | | SCAC4 |
| 46 | HBCU | HOLDERCHEM BUILDING CHEMICALS S A L | | | SCAC4 |
| 47 | HBCY | HERMANS BUILDING CENTRES | | | SCAC4 |
| 48 | HBD | Hubbardair Ltd. | Callsign: Hubbardair, | GB | AVCODES |
| 49 | HBDC | H & B DISHER COURIER (WOON | | | SCAC4 |
| 50 | HBDF | HUBERDALE FARMS | | | SCAC4 |
| 51 | HBDL | HERRBOLDT TRUCKING LLC | | | SCAC4 |
| 52 | HBDN | HOBDEN, KEITH | | | SCAC4 |
| 53 | HBDS | HARBOR DISPATCH TRANSPORT INC | | | SCAC4 |
| 54 | HBDV | HARBOR DIVISION | | | SCAC4 |
| 55 | HBDW | HIGHBOURNE TRADING LTD | | | SCAC4 |
| 56 | HBE | Halberstadt-Blankenburger Eisenbahn | | D | TRAFFIC |
| 57 | HBE | Verein zur Erhaltung der Hespertalbahn e.V. | | DE | VKM |
| 58 | HBEC | HOBBS ENTERPRISES INC | | | SCAC4 |
| 59 | HBEE | HB ENTERPRISES | | | SCAC4 |
| 60 | HBEI | HOLMES BROTHER ENTERPRISES INC | | | SCAC4 |
| 61 | HBEK | HORNBECK TRANSPORT LLC | | | SCAC4 |
| 62 | HBEL | HABEL TRANSPORTATION INC | | | SCAC4 |
| 63 | HBEN | HOFFMAN, BOB ENTERPRISES | | | SCAC4 |
| 64 | HBER | HUBER, ARLO & SON INC | | | SCAC4 |
| 65 | HBES | HUDDLESTON&BISHOP ENTERPRISES, INC | | | SCAC1 |
| 66 | HBET | HB EXPRESS INC | | | SCAC4 |
| 67 | HBEY | H & B EQUIPMENT COMPANY INC | | | SCAC4 |
| 68 | HBFA | H B FARMS (MX-240006) | | | SCAC4 |
| 69 | HBFB | HILES BROS FUEL CO INC | | | SCAC4 |
| 70 | HBFE | HR & B FEDERATED EXPRESS TRANSCORP | | | SCAC4 |
| 71 | HBFG | HERBERT FEED & GRAIN CO | | | SCAC4 |
| 72 | HBFL | HERNANDEZ BLANCAS, FELIX | | | SCAC4 |
| 73 | HBFO | HARBOR FUEL OIL CORP | | | SCAC4 |
| 74 | HBFT | HARMAN BROTHERS FREIGHT LTD | | | SCAC4 |
| 75 | HBFY | HESS BROTHERS FRUIT COMPANY | | | SCAC4 |
| 76 | HBG | Hamburg Chile Airlines, S.A. | Callsign: Hamburg Airline, | RCH | AVCODES |
| 77 | HBG | Hafenbetriebsgesellschaft mbH | Hildesheim | D | privat-bahn.de |
| 78 | HBGI | HUB GROUP INC | | | SCAC4 |
| 79 | HBGL | HUBERT GLASS OIL CO | | | SCAC4 |
| 80 | HBGM | HERMANN BUSS GMBH & CIE | | | SCAC4 |
| 81 | HBGO | HELD BEREEDERUNGS GMBH & CO KG | | | SCAC4 |
| 82 | HBGP | HALLIBURTON GROUP CANADA | | | SCAC4 |
| 83 | HBGR | HOGBERG, ROBIN TODD | | | SCAC4 |
| 84 | HBGS | HUDSON LOGISTICS INC | | | SCAC4 |
| 85 | HBGU | HABAS SINAI VE TIBBI GAZLAR | | TR | BIC |
| 86 | HBGX | HBG Enterprises of Tampa, Inc. | added 10/1984; 1/1994-7/2005 | | NAKINA |
| 87 | HBGX | Hillsboro Bottled Gas Co. | added 10/1968; 4/1970-1/1980; eliminated 10/1984 | | NAKINA |
| 88 | HBGX | Hugger Brothers Gravel Co. | 8/1920 | | NAKINA |
| 89 | HBGX | Hillsboro Bottled Gas Co. | added 10/68; 4/70-1/80; eliminated 10/84 | | NRHS |
| 90 | HBGX | HBG Enterprises of Tampa, Inc. | added 10/84; 1/94-7/2000 | | NRHS |
| 91 | HBGX | *HUGGER BROTHERS GRAVEL CO. | | | PWRC |
| 92 | HBGX | +HBG ENTERPRISES OF TAMPA, INC. [HILLSBORO BOTTLED GAS CO.] | | | PWRC |
| 93 | HBGX | Hillsboro Bottled Gas (HBG Enterprises of Tampa) | | | RSRV |
| 94 | HBGX | HBG ENTERPRISES OF TAMPA, INC. | | | SCAC4 |
| 95 | HBH | Hebei Airlines Co., Ltd. | IATA: NS, Callsign: Hebei Air, IATA Prefix: 836, Name changed from Northeast Airlines Co. Ltd. | PRC | AVCODES |
| 96 | HBHF | H B HELLER FASHION TEAM INC | | | SCAC4 |
| 97 | HBI | CHC Denmark APS | Callsign: Helibird, | DK | AVCODES |
| 98 | HBI | CHC Denmark | | | ICAO1 |
| 99 | HBIC | HARBOR BRIDGE INTERMODAL INC | | | SCAC4 |
| 100 | HBII | HARBOUR INTERNATIONAL INCORPORATED | | | SCAC4 |
