| Company | Search On | Records | Category | Sub category |
| Habershon And Sons Ltd. J J. | Habershon | 119 | Materials | Steel |
| Hadfields (Merton) Ltd | Hadfields | 27 | Finishes | Paints |
| Hadley Company Ltd | Hadley | 4 | Materials | Transparencies |
| Hong Kong Aircraft Engineering Co Ltd | HAEC | 1 | Maintenance | Contractors |
| Haighs (Oldham Ltd | Haighs | 8 | Engineering Equipment | Machinery |
| Haithwaite Aviation Co | Haithwaite | 2 | Manufacturing | Sheet Metal Work |
| Hale Hamilton & Co Ltd | HaleHamilton | 13 | Components | Valves |
| Hales Cox | Hales | 12 | Models | Flying |
| Hall & Sons (Bristol & London) Ltd. John | Hall | 63 | Finishes | Dope |
| Hall Bayliss & Co | HallBayliss | 2 | Manufacturing | Sheet Metal Work |
| Hall & Hall Ltd | HallHall | 20 | Components | Seals |
| Hall & Pickles Ltd | HallPickles | 39 | Manufacturing | Steel |
| Hall School Of Flying | HallSchool | 36 | Training | Flying School |
| Halpins Of Hampshire Ltd | Halpins | 5 | Avionics | Navigation |
| Hamble. College Of Air Training | Hamble | 38 | Training | Flying School |
| Hamilton Standard Propeller Company | HamiltonStandard | 1 | Components | Propellers |
| Hammant Aeroplane Syndicate Ltd | Hammant | 1 | Aircraft Manufacturers | |
| Hampshire Aeroplane Club | HampshireClub | 12 | Training | Flying School |
| Hampson Industries Ltd | Hampson | 14 | Ground Equipment | Ground Power Units |
| Handasyde Aircraft Co Ltd | Handasyde | 2 | Aircraft Manufacturers | |
| Handley Page Ltd | HandleyPage | 591 | Aircraft Manufacturers | |
| Hanriot (England) Ltd | Hanriot | 3 | Aircraft Manufacturers | Non UK |
| Hamburger Flugzeugbau GmbH | Hansa | 2 | Aircraft Manufacturers | Non UK |
| Hants & Sussex Aviation | HantsSussex | 1 | Aircraft | Aircraft Sales |
| Hanworth Air Park Aldeham Aerodrome | Hanworth | 7 | Airfields | Airfield Operators |
| Hard Aluminium Surfaces Ltd | HardAluminium | 1 | Manufacturing | Anodising |
| Hardimond Ltd | Hardimond | 2 | Engineering Equipment | Machine Tools |
| Hardingham Bros | HardinghamBros | 5 | Manufacturing | Components |
| Hardman Tool & Engineering Co | Hardman | 8 | Role Equipment | Seals |
| Hardy Spicer Ltd | HardySpicer | 19 | Components | Controls |
| Harland's | Harlands | 5 | Finishes | Paints |
| Harley-Davidson Motor Co Ltd | HarleyDavidson | 1 | Manufacturing | Components |
| Harley Aircraft Landing Lamps | HarleyLamps | 4 | Components | Lighting |
| Harold Harley & Co | HaroldHarley | 3 | Components | Sheet Metal Work |
| Harrington Ltd. Thomas | Harrington | 1 | Manufacturing | |
| Harrisflex Bearings Ltd | Harrisflex | 3 | Components | Bearings |
| Harrison & Co | HarrisonCo | 2 | Manufacturing | Components |
| Harrison Smith | HarrisonSmith | 2 | Structures | Hangars |
| Harris & Others Ltd | HarrisOthers | 3 | Aeronautical Engineers | |
| Harris Plating Works Ltd. The | HarrisPlating | 1 | Finishes | Electroplating |
| Harris & Sheldon Ltd | HarrisSheldon | 5 | Manufacturing | Components |
| Harrods Ltd | Harrods | 4 | Clothing | Flying Clothing |
| Hartley Electromotives Ltd | HartleyElectromotives | 1 | Manufacturing | Cables |
| Harts | Harts | 6 | Materials | Fabric |
| Harvey Frost & Co Ltd | HarveyFrost | 1 | Engineering Equipment | Tools |
| Hasler Telegraph Works | HaslerTelegraph | 6 | Instrument Manufacturers | Flight Instruments |
| Hathershaw Sheet Metal Co Ltd | Hathershaw | 2 | Manufacturing | Sheet Metal Work |
| Hawker Engineering Co Ltd (H.G.) | Hawker | 357 | Aircraft Manufacturers | |
| Hawker Siddeley Group | HawkerSiddeley | 428 | Aircraft Manufacturers | |
| Hawkes & Snow Ltd | HawkesSnow | 2 | Structures | Hangars |
| Hayes Engineers (Leeds) Ltd | HayesEngineers | 1 | Manufacturing | Jig & Patternmakers |
| Hays, Hunter & Standen Ltd | HaysHunter | 1 | Manufacturing | AGS |
| Hayward Foundries Ltd | HaywardFoundry | 1 | Manufacturing | Castings |
| Haywards Ltd | Haywards | 3 | Structures | Hangars |
| Hazel & Co | Hazel | 8 | Clothing | Flying Clothing |
| Hazlewood & Dent Ltd | HazlewoodDent | 1 | Engineering Equipment | Machine Tools |
| H.Barnett | HBarnett | 1 | Manufacturing | Ropes |
| H.B.Barnard & Sons | HBBarnard | 3 | Materials | Recycling |
| H.B.Sale Ltd | HBSale | 3 | Manufacturing | Sheet Metal Work |
| H.C.Hopper & Co Ltd | HCHopper | 1 | Engineering Equipment | Machine Tools |
| High Duty Alloys, Ltd | HDA | 319 | Materials | Aluminium Alloys |
| H.Dutton & Co Ltd | HDutton | 1 | Factory | Air Conditioning |
| Healthguard | Healthguard | 23 | Components | Covers |
| Heaps, Arnold & Heaps | HeapsArnold | 1 | Manufacturing | Lead |
| Heavy Stampings Ltd | HeavyStampings | 2 | Manufacturing | Stampings |
| Hector Powe |
HectorPowe |
12 | | |
| Heenan & Froude Ltd | HeenanFroude | 15 | Testing | Dynamometers |
| H.E.Hartley | HEHartley | 1 | Survival Equipment | Fire Safety |
| Heinkel | Heinkel | 1 | Aircraft Manufacturers | Non UK |
| Helicopter Sales Ltd | HelicopterSales | 2 | Aircraft Suppliers | Rotary Wing |
| Hellermann Electric Ltd | Hellermann | 62 | Engineering Equipment | Electrical |
| Helliwells Ltd | Helliwells | 76 | Maintenance | Contractors |
| Helmets Ltd | Helmets | 2 | Clothing | Flying Clothing |
| Henderson Safety Tank Co Ltd | HendersonTank | 12 | Components | Fuel Tanks |
| Hendon | Hendon | 140 | Airfields | Airfield Operators |
| Hendrey Relays | Hendrey | 29 | Components | Electrical |
| Henlys | Henlys | 31 | Training | Flying School |
| Henry J Brewster & Co | HenryBrewster | 6 | Engineering Equipment | Machinery |
| Henry Browne & Son Ltd | HenryBrowne | 15 | Instrument Manufacturers | Flying |
| Henry Caton & Co | HenryCaton | 2 | Manufacturing | Sheet Metal Work |
| Henry Crossley (Packings) Ltd | HenryCrossley | 1 | Manufacturing | Wire |
| Henry Durke Ltd | HenryDurke | 2 | Manufacturing | Sheet Metal Work |
| Henry Howell & Co Ltd | HenryHowell | 1 | Manufacturing | Woodworking |
| Henry Hughes & Son Ltd | HenryHughes | 10 | Instrument Manufacturers | Flight Instruments |
| Henry Lindsay Ltd | HenryLindsay | 5 | Components | Fasteners |
| Henry Miller And Co Ltd | HenryMiller | 13 | Maintenance | Jacks |
| Henry Pels & Co Ltd | HenryPels | 6 | Engineering Equipment | Machine Tools |
| Henry Simonis & Co | HenrySimonis | 1 | Manufacturing | Woodworking |
| Henry Wells Oil Co Ltd | HenryWells | 1 | Lubricant Suppliers | |
| Henry Wiggin & Co Ltd | HenryWiggin | 119 | Materials | Nimonic Alloys |
| Henschel Flugzeug Werke AG | Henschel | 5 | Aircraft Manufacturers | Non UK |
| Hepworth & Grandage Ltd | Hepolite | 35 | Components | Piston Rings |
| Herbert Chappell | HerbertChappell | 10 | Clothing | Uniforms |
| Herbert Morris Ltd | HerbertMorris | 1 | Ground Equipment | Cranes |
| Herbert W.Porter | HerbertPorter | 2 | Engine Manufacturers | |
| Herman & Phillips Ltd | HermanPhillips | 1 | Components | Propellers |
| Herman Smith (Aero Services) Ltd | HermanSmith | 12 | Components | Galley Equipment |
| Hermeticoll. Patent Motor Products Co | Hermeticoll | 9 | Materials | Jointing Compounds |
| Herrtage Holyoake & Co | HerrtageHolyoake | 1 | Manufacturing | Fasteners |
| Herts & Essex Aero Club | HertsAndEssex | 16 | Training | Flying School |
| Herts Pharmaceuticals Ltd | HertsPharmaceuticals | 9 | Maintenance | Electrical |
| Heseltine Evelyn & Co Ltd | HeseltineEvelyn | 2 | Lubricant Suppliers | |
| Hesse & Savory | HesseSavory | 3 | Aeronautical Engineers | |
| Heston Airport | Heston | 26 | Airfields | Airfield Operators |
| Heston Aircraft Company Ltd | HestonAircraft | 14 | Recruitment | Draughtsmen |
| Hewell Spring Co Ltd | HewellSpring | 1 | Components | Springs |
| Hewlett & Blondeau | HewlettBlondeau | 1 | Aeronautical Engineers | |
| Hewson Mfg.co.ltd | HewsonMFG | 2 | Manufacturing | Sheet Metal Work |
| Hey Engineering Co Ltd |
Hey | 2 | Engineering Equipment | Machine Tools |
| Hickman Aircraft Ltd | Hickman | 14 | Components | Galley |
| Hiduminium Applications Ltd | HiduminiumApplications | 12 | Materials | Hiduminium |
| Highbury Aircraft Co | HighburyAircraft | 5 | Manufacturing | Sheet Metal Work |
| Highgate Aircraft Co Ltd. The | HighgateAircraft | 1 | Aeronautical Engineers | |
| Highland Airways Ltd | HighlandAirways | 1 | Air Transport | Airlines |
| High Pressure Components Ltd | HighPressureComponents | 22 | Components | Piping |
| High Tension Wires Ltd | HighTension | 1 | Components | Springs |
| Hill Aldam & Co Ltd. E. | HillAldam | 1 | Factory | Doors |
| Hill Bros | HillBros | 2 | Airfields | Passenger Handling |
| Hiller Aircraft Corp | Hiller | 20 | Aircraft Manufacturers | Rotary Wing |
| Hiller & Son (Engineering) Ltd | Hillier | 2 | Manufacturing | Engineering |
| Hillmans Airways | Hillmans | 13 | Air Transport | Airlines |
| Hills & Sons Ltd. F. | Hillson | 37 | Aircraft Manufacturers | |
| Hilmor Ltd | Hilmor | 2 | Engineering Equipment | Piping |
| Hindustan Aircraft Ltd | Hindustan | 13 | Aircraft Manufacturers | Non UK |
| Hirst Magneto Co Ltd. The | HirstMagneto | 1 | Components | Magnetos |
| Hirth-Motoren G.m.b.H. | Hirth | 2 | Engine Manufacturers | Non UK |
| Hispano Suiza | HispanoSuiza | 24 | Engine Manufacturers | Non UK |
| H.K.Porter Company (Great Britain) Limited | HKPorter | 16 | Ground Equipment | Hoses |
| H.Miller & Co Ltd | HMiller | 12 | Components | Electrical |
| HML (Engineering) Ltd | HML | 61 | Ground Equipment | Test Equipment |
| Hobart Brothers Company | Hobart | 1 | Ground Equipment | Ground Power Units |
| Hobdell, Way & Co Ltd | HobdellWay | 8 | Components | Piping |
| Hobourn Aero Components Ltd | HobournAero | 22 | Fabrication | Precision Engineering |
| H M Hobson Ltd | Hobson | 359 | Components | Carburetters |
| Hoffmann Mfg Co Ltd | Hoffmann | 103 | Components | Bearings |
| Propellerwerk Hoffmann | HoffmannPropeller | 2 | Components | Propellers |
| Hoggett Young & Co | HoggettYoung | 7 | Ground Equipment | Welding |
| Holloway & Co | Holloway | 3 | Sales & Brokerage | |
| Hull Oil Manufacturing Co Ltd | Homco | 4 | Lubricant Suppliers | |
| Honeywell Controls Ltd | Honeywell | 31 | Components | Electrical |
| Hooper & Co | Hooper | 6 | Manufacturing | Sheet Metal Work |
| Hooper & Edman Ltd | HooperEdman | 2 | Manufacturing | Sheet Metal Work |
| Hoover Limited | Hoover | 5 | Factory | Cleaning Tools |
| Hope's | Hopes | 2 | Factory | Lighting |
| Hopton & Sons | Hoptons | 9 | Materials | Wood |
| Hora Ltd. E & H. | Hora | 2 | Aircraft Manufacturers | |
| Hordern, Mason & Edwards Ltd | HordernMason | 7 | Engineering Equipment | Machine Tools |
| Hordern-Richmond Aircraft Ltd | HordernRichmond | 49 | Materials | Wood |
| Horseley Bridge & Engineering Co Ltd | Horseley | 48 | Airfields | Hangars |
| Horton Manufacturing Co Ltd | Horton | 2 | Health And Safety | Personal Protection |
| Hoskins & Sewell Ltd | HoskinsSewell | 3 | Manufacturing | Presswork |
| Houchin Ltd | Houchin | 26 | Ground Equipment | Ground Power Units |
| Houdalille Hydraulic Suspension Co Ltd. The | Houdalille | 2 | Components | Hydraulics |
| Howard Aircraft Corporation | Howard | 1 | Aircraft Manufacturers | Non UK |
| Howard-Flanders Ltd. L. | HowardFlanders | 9 | Aircraft Manufacturers | |
| Howard Graham Ltd | HowardGraham | 1 | Manufacturing | Seals |
| Howard Lane | HowardLane | 2 | Gases | Hydrogen |
| Howard T. Wright | HowardWright | 22 | Aircraft Manufacturers | |
| Howmet Corporation | Howmet | 2 | Manufacturing | Components |
| Hoyt Metal Co Ltd | Hoyt | 43 | Materials | White Metal |
| H.Robinson & Sons | HRobinson | 2 | Engineering Equipment | Stamps |
| H. Rollet & Co Ltd | HRollet | 27 | Materials | Metals |
| Hawker Siddeley Aviation |
HSA | 465 | Aircraft Manufacturers | |
| H.Tinsley & Co Ltd | HTinsley | 4 | Testing | Measuring Equipment |
| H.T.Newton | HTNewton | 4 | Aircraft Parts | Electrical |
| Hubbard Ltd. S. | Hubbard | 4 | Materials | Felt |
| Hucks Company. B.C. | Hucks | 2 | Aerial Work | Air Show |
| Hudes Merchandising Corporation | Hudes | 1 | Pilot Supplies | Navigation |
| Hudson & Kearns Ltd | HudsonKearns | 1 | Office | Office Equipment |
| Hughes International | HughesInternational | 78 | Aircraft Manufacturers | Non UK |
| Hughes-Johnson Stampings Ltd | HughesJohnson | 8 | Manufacturing | Stampings |
| Hughes Lathbury Ltd | HughesLathbury | 2 | Manufacturing | Spinnings |
| Humber Ltd (Aerial Dept) | Humber | 40 | Aircraft Manufacturers | |
| Humphries & Dawes Ltd | HumphriesDawes | 2 | Manufacturing | Engineering |
| Hunters Of Chester | Hunters | 22 | Airfields | Construction |
| Hunter Spring | HunterSpring | 1 | Testing | Test Equipment |
| Hunting Aircraft Ltd |
Hunting |
70 | Aircraft Manufacturers | |
| Hunting Chairline Ltd | HuntingChairline | 1 | Components | Seating |
| Hunting Percival Aircraft Ltd | HuntingPercival | 69 | Aircraft Manufacturers | |
| Hunt Partners Ltd | HuntPartners | 1 | Factory | Logistics |
| Hurel-Dubois | HurelDubois | 2 | Aircraft Manufacturers | Non UK |
| Hurlingham Aircraft Co. The | HurlinghamAircraft | 2 | Finishes | Covering & Doping |
| Hutchinson & Co Publishers Ltd | Hutchinson | 2 | Literature | Publishers |
| Hutchinson Co | HutchinsonAerocloths | 14 | Materials | Fabrics |
| H.W.Kearns & Co Ltd | HWKearns | 1 | Manufacturing | Machine Tools |
| Hycrome Ltd | Hycrome | 1 | Manufacturing | Plating |
| Hymatic Engineering Co Ltd | Hymatic | 135 | Components | Pneumatics |
