| Company | Search On | Records | Category | Sub category |
| B. & F.Carter & Co Ltd | B FCarter | 1 | Components | Pipework |
| British Airways | BA | 12 | Air Transport | Airlines |
| British Aircraft Corporation | BAC | 283 | Aircraft Manufacturers | |
| Back & Manson | BackManson | 1 | Components | Engine Starters |
| British Aerospace | BAe | 42 | Aircraft Manufacturers | |
| British Air Ferries | BAF | 8 | Air Transport | Airlines |
| British Aviation Insurance Co Ltd | BAI | 67 | Finance | Insurance |
| Bain.William & Co Ltd | Bain | 9 | Structures | Hangars |
| Bakelite Ltd | Bakelite | 46 | Materials | Bakelite |
| Baldwins Ltd | Baldwins | 26 | Materials | Steel |
| Balfour (Marine) Engineering Co Ltd | Balfour | 1 | Manufacturing | Machining |
| Balsa Wood | BalsaWood | 1 | Materials | Wood |
| Banbury Aviation Co | BanburyAviation | 2 | Aircraft Parts | Components |
| Banister Walton & Co Ltd | BanisterWalton | 7 | Structures | Hangars |
| Bristol Aeroplane Plastics Ltd | BAPL | 2 | Materials | Plastics |
| Barber & Colman Ltd | BarberColman | 5 | Fasteners | AGS |
| Barden Corporation (UK) Ltd | BardenUK | 1 | Components | Bearings |
| Barimar Ltd | Barimar | 51 | Materials | Welding |
| Barlow-Whitney Ltd | BarlowWhitney | 4 | Engineering Equipment | Process Heating Equipment |
| The Barnes Aeroplane Company | BarnesAeroplane | 4 | Aircraft Constructors | |
| Barnes Mechanical Works | BarnesMechanical | 1 | Manufacturing | AGS |
| Barnet Instruments Ltd | Barnet | 13 | Instrument Manufacturers | Flight Instruments |
| Barnet & Foster | BarnetFoster | 1 | Engineering Equipment | Hand Tools |
| Barrow Haematite Steel Co | BarrowHaematite | 1 | Materials | Steel |
| Basingstoke Airport | Basingstoke | 1 | Airfields | |
| British Air Transport Ltd | BAT | 36 | Training | Flying School |
| Bath Aircraft Ltd | BathAircraft | 2 | Aircraft Manufacturers | |
| B. Attewell & Sons Ltd | BAttewell | 5 | Materials | Aluminium |
| W B Bawn & Co Ltd | Bawn | 11 | Fabrication | Sheet Metal Work |
| The Baxenden Chemical Co Ltd | Baxenden | 1 | Manufacturing | Plastics |
| Baxters (Bolts, Screws & Rivets) Ltd | Baxters | 8 | Fasteners | AGS |
| Bayliss, Jones & Bayliss | BaylissJones | 3 | Fasteners | AGS |
| Baynes Aircraft Interiors Ltd | BaynesInteriors | 3 | Recruitment | Loftsmen |
| Baynes & Partners Ltd | BaynesPartners | 1 | Manufacturing | Sheet Metal Work |
| B.Cannon & Co Ltd | BCannon | 1 | Chemicals | Adhesives |
| British Communications Corporation Ltd | BCCComms | 15 | Airfields | Air Traffic Control |
| B.Cohen & Sons Ltd | BCohen | 1 | Components | Wood |
| BDV Aircraft Spares | BDV | 2 | Manufacturing | Components |
| Benes-MRAZ | BE | 1 | Aircraft Manufacturers | Non UK |
| British European Airways | BEA | 170 | Air Transport | Airlines |
| British Executive & General Aviation Ltd | Beagle | 107 | Aircraft Manufacturers | |
| William Beardmore and Co Ltd | Beardmore | 98 | Aircraft Manufacturers | |
| British Executive Air Services Ltd | BEAS | 18 | Avionics | Navigation |
| Beasleys Belt | BeasleysBelt | 2 | Clothing | Flying Clothing |
| Beatty School Of Flying | BeattySchool | 51 | Training | Flying School |
| New Forest Aviation School Beaulieu | Beaulieu | 3 | Training | Flying School |
| Beck Koller & Co (England) Ltd | BeckKoller | 1 | Materials | Fibre Glass |
| Beckman Instruments Ltd | Beckman | 1 | Avionics | Electronics |
| Becket, Laycock & Watkinson Ltd | Beclawat | 2 | Materials | Transparencies |
| Bede Aircraft Inc | Bede | 1 | Aircraft Manufacturers | Non UK |
| Beechcraft | Beechcraft | 101 | Aircraft Manufacturers | Aircraft |
| Beetle Products Co Ltd. The | BeetleProducts | 2 | Materials | Adhesives |
| Borgs Fabriks AB | BEFAB | 4 | Airfields | Barriers |
| Beldam Tyre Co Ltd | Beldam | 3 | Vehicles | Tyres |
| Belfast Ropework Co Ltd | BelfastRopework | 1 | Manufacturing | Rope |
| Bell Aircraft Corporation | Bell | 67 | Aircraft Manufacturers | |
| Bellanca | Bellanca | 2 | Aircraft Manufacturers | Non UK |
| Bell Precision Engineering Co Ltd | BellEngineering | 1 | Manufacturing | Precision Engineering |
| Bell & Howell Ltd | BellHowell | 1 | Components | Controls |
| Belling & Lee Ltd | Belling | 15 | Manufacturing | Electrical |
| Bellman Hangars Ltd | Bellman | 10 | Structures | Hangars |
| Bell's Asbestos & Engineering Ltd | Bells | 30 | Materials | Asbestos |
| BEME Telecommunications Ltd | BEME | 3 | Avionics | Radio |
| B.E.N.Patents Ltd | BEN | 37 | Engineering Equipment | Spraying Equipment |
| Bendix Ltd | Bendix | 126 | Components | Electrical |
| The Bendix Corporation | BendixCorp | 59 | Components | Avionics |
| Beney. Robert & Co | Beney | 6 | Components | Propellers |
| Benjamin Electric Ltd.The | BenjaminElectric | 10 | Factory | Lighting |
| Bennet (Hyde) Ltd (GUNK) | BennetGunk | 3 | Chemicals | Gunk |
| Benoist | Benoist | 5 | Aircraft Manufacturers | Non UK |
| Benton & Stone Ltd | BentonStone | 3 | Manufacturing | Valves |
| British Electrical Resistance Co Ltd. The | Berco | 1 | Components | Electrical |
| Berger & Sons Ltd. Lewis | Berger | 22 | Finishes | Paints |
| Beritex | Beritex | 3 | Airfields | Sounding Balloons |
| Berkeleys Ltd | Berkeleys | 3 | Clothing | Uniforms |
| Berkshire Aviation Co Ltd | BerkshireAviation | 2 | Aerial Work | Air Charter |
| Beru-Werk | BeruWerk | 1 | Components | Non UK |
| Consolidated Beryllium Ltd | Beryllium | 1 | Materials | Beryllium |
| Bessbrook Spinning Co Ltd. The | BessbrookSpinning | 3 | Materials | Fabric |
| Bessonneau | Bessonneau |
2 | Structures | Hangars |
| Besson & Robinson Ltd | BessonRobinson | 1 | Components | Electrical |
| Best & Lloyd Ltd | BestLloyd | 5 | Manufacturing | Machining |
| Bestobell Aviation Products | Bestobell | 4 | Components | |
| Beverley Engineering Works | BeverleyEngineering | 2 | Manufacturing | Cylinders |
| B & F Carter & Co Ltd | BFCarter | 5 | Engineering Equipment | Counters |
| B.F.Collingridge | BFCollingridge | 3 | Ground Equipment | Passenger Handling |
| B.F.Goodrich International | BFGoodrich | 1 | Components | De-Icing |
| B & H Nottingham Ltd | BH | 1 | Components | AGS |
| British Hovercraft Corporation Ltd | BHC | 15 | Aircraft & Engine Manufacturers | Hovercraft |
| British Insulated Callenders Cables Ltd | BICC | 122 | Components | Wire |
| BIET | BIET | 11 | Training | Flying |
| Bifurcated & Tubular Rivet Co Ltd. The | BifurcatedRivet | 11 | Engineering Equipment | Machinery |
| Surrey And Kent Flying Club (Biggin Hill) | BigginHill | 1 | Training | Flying School |
| Billington & Newton | BillingtonNewton | 2 | Manufacturing | Castings |
| Bi-Metals Ltd | BiMetals | 1 | Manufacturing | Solder |
| British Industrial Plastics Ltd | BIP | 1 | Materials | Melamine |
| The Birch Aircraft Manufacturing Co Ltd | BirchAircraft | 2 | Manufacturing | Components |
| Birfield Industries Ltd | Birfield | 6 | Manufacturing | Castings |
| Birkett & Sons Ltd. T M | Birkett | 42 | Fabrication | Machining |
| Birlec Ltd | Birlec | 1 | Manufacturing | Dehumidifiers |
| Birmabright Ltd | Birmabright | 12 | Manufacturing | Steel |
| Birmingham Aluminium 1903 Co Ltd | Birmal | 74 | Materials | Aluminium |
| Birmetals Ltd | Birmetals | 58 | Materials | Aluminium Alloys |
| Birmingham Airport | Birmingham | 1 | Airfields | |
| Birmingham Battery & Metal Co Ltd | BirminghamBattery | 8 | Materials | Copper |
| Birmingham & Blackburn Construction Ltd | BirminghamBlackburn | 1 | Manufacturing | Jigs |
| Birmingham Guild Ltd | BirminghamGuild | 8 | Manufacturing | Components |
| B & K Laboratories | BKLabs | 1 | Airfields | Air Traffic Control |
| B.K.S. Engineering Ltd | BKS | 17 | Maintenance | Contractors |
| Black & Decker Ltd | BlackandDecker | 151 | Engineering Equipment | Machining |
| Blackburn Aeroplane and Motor Co Ltd | Blackburn | 564 | Aircraft Manufacturers | |
| Blackburns Ltd | BlackburnsLtd | 1 | Materials | Metals |
| Blackstone & Co Ltd | Blackstone | 4 | Engine Manufacturers | Industrial |
| Blanik | Blanik | 1 | Aircraft Manufacturers | Glider |
| Bleriot Ltd | Bleriot | 65 | Aircraft Suppliers | Representatives |
| British Landing Gears Ltd | BLG | 3 | Components | Landing Gear |
| British Lighting & Ignition Co Ltd | Blic | 12 | Components | Magnetos |
| Bliss Company. E.W. | Bliss | 14 | Engineering Equipment | Machinery |
| Bloctube Controls Ltd | Bloctube | 28 | Components | Controls |
| Blohm & Voss | BlohmVoss | 5 | Aircraft Manufacturers | Non UK |
| British Midland Airways | BMA | 5 | Air Transport | Air Charter |
| B.M.B. Sales Ltd (Dept 9) | BMB | 5 | Instrument Manufacturers | Aircraft |
| Bayerische Motern Werke | BMW | 3 | Engine Manufacturers | Non UK |
| B.N.Aircraft | BNAircraft | 1 | Components | Starters |
| British Overseas Airways Corporation | BOAC | 114 | Air Transport | Airlines |
| Boddy Life Saving Jacket Co | Boddy | 3 | Survival Equipment | Life Jackets |
| Boeing | Boeing | 173 | Aircraft Manufacturers | Non UK |
| Bofors. AB | Bofors | 22 | Weapons | Non UK |
| Bolkow-Apparatebau GmbH | Bolkow | 15 | Aircraft Manufacturers | Non UK |
| Bolton Gate Company Ltd | BoltonGate | 30 | Structures | Hangars |
| Bonella & Son Ltd. D.H. | Bonella | 51 | Components | Electrical |
| Boorn & Co Ltd. Thos | Boorn | 15 | Components | Piping |
| Boosey & Hawkes Ltd | BooseyHawkes | 3 | Avionics | Test Equipment |
| Booth (James) and Co | Booth | 135 | Materials | Duralumin |
| Borel. Societe Des Aeroplanes. | Borel | 1 | Aircraft Manufacturers | |
| Bosch Ltd | Bosch | 41 | Engineering Equipment | Hand Tools |
| Boscombe Precision Engineering | BoscombePrecision | 3 | Factory | Heaters |
| B.B.Chemical Co Ltd (Bostik) | Bostik | 94 | Materials | Adhesives |
| Bougie-Pognon Ltd | BougiePognon | 2 | Components | Spark Plugs |
| Boulton & Paul Ltd / Boulton Paul Aircraft | Boulton Paul |
471 | Aircraft Manufacturers | Structural Engineering |
| British Bound Brook Bearing Co | BoundBrook | 6 | Components | Bearings |
| Bournemouth Aviation Company Ltd | BournemouthAviation | 19 | Training | Flying School |
| Bowater Packaging Ltd | Bowater | 1 | Airport Services | Catering |
| Bowden (Engineers) Ltd | Bowden | 76 | Components | Controls |
| Bowen Instrument Co | BowenInstrument | 3 | Instrument Manufacturers | Temperature Control |
| Bowthorpe-Hellermann Group | BowthorpeHellermann | 3 | Components | Electrical |
| Boyd | Boyd | 17 | Engine Manufacturers | |
| Boyton & Son. Charles | Boyton | 2 | Manufacturing | Presswork |
| British Petroleum Co Ltd | BP | 179 | Fuel Suppliers | |
| B & P.Swift Ltd | BPSwift | 1 | Aeronautical Engineers | |
| Fredk Braby & Co Ltd | Braby | 15 | Fabrication | Sheet Metal Work |
| The Bradford Dyers' Association Ltd | BradfordDyers | 5 | Clothing | Factory |
| Bradley & Craven Ltd | BradleyCraven | 4 | Engineering Equipment | Machine Tools |
| Bradshaw Bros (Contractors) Ltd | BradshawBros | 4 | Airfields | Construction |
| Brady & Co Ltd. G. | Brady | 2 | Manufacturing | Shutters |
| Brailey Electroplaters | BraileyElectro | 21 | Manufacturing Processes | Electroplating |
| Braime Ltd. T.F & J.H. | Braime | 5 | Manufacturing | Sheet Metal Work |
| Braithwaite & Co Engineers Ltd | Braithwaite | 1 | Engineers | Structural |
| Bramah & Co Ltd. J R | Bramah | 31 | Fabrication | Sheet Metal Work |
| Bramble Sheet Metal & Engineering Co Ltd. | Bramble | 1 | Manufacturing | Sheet Metal Work |
| Brampton Bros Ltd | BramptonBros | 4 | Components | Chains |
| Brandenburgische Motorenwerke | Brandenburgische | 10 | Engine Manufacturers | Non UK |
| Braniff International Airways | Braniff | 4 | Air Transport | Airlines |
| Bratt Colbran Limited | BrattColbran | 1 | Manufacturing | Engineering |
| Brayshaw Furnaces & Tools Ltd | BrayshawFurnaces | 1 | Engineering Equipment | Furnaces |
| BRD Company Ltd | BRD | 9 | Manufacturing | Machining |
| Breda. Societa Italiana Ernesto | Breda | 28 | Aircraft Manufacturers | Non UK |
| BredaNardi Construzioni Aeronautiche s.p.a. | BredaNardi | 18 | Aircraft Manufacturers | Non UK |
| Breen Hang Gliders | Breen | 1 | Aircraft Manufacturers | Hang Glider |
| Breguet Aeroplanes Ltd | Breguet | 25 | Aircraft Manufacturers | Non UK |
| Brett's Patent Lifter Co Ltd | BrettsLifter | 1 | Engineering Equipment | Machine Tools |
| Brewster | Brewster | 26 | Aircraft Manufacturers | Non UK |
| Brian Allen Aviation Ltd | BrianAllen | 26 | Aircraft Suppliers | |
| Brian Lewis & Co | BrianLewis | 16 | Sales & Brokerage | Aircraft |
| British Piston Ring Co | Brico | 67 | Components | Piston Rings |
| Bricovmo Ltd | Bricovmo | 6 | Components | Piston Rings |
| Briggs Motor Bodies Ltd | Briggs | 16 | Manufacturing | Precision Engineering |
| Chanter (Brighton) | Brighton | 14 | Airfields | |
| Brightside Plating Co Ltd | BrightsidePlating | 1 | Finishes | Electroplating |
| Bristol Aeroplane Company | Bristol | 2618 | Aircraft & Engine Manufacturers | |
| Bristol Pneumatic Tools Ltd | Bristol Pneumatic |
1 | Engineering Equipment | Hand Tools |
| Bristol Aerojet Ltd | BristolAerojet | 25 | Manufacturing | Pressure Vessels |
| Bristol Airport | BristolAirport | 8 | Airfields | Airfield Operators |
| Bristol Siddeley Engines Ltd | BristolSiddeley | 205 | Engine Manufacturers | |
| Bristow Helicopter Group | Bristow | 16 | Training | Rotary Wing |
| Britannia Airways | Britannia | 2 | Air Transport | Airlines |
| Britannia Tube Co Ltd. The | BritanniaTube | 1 | Maintenance | Tubing |
| British Gold Shell Ring Co Ltd | BritGoldShell | 2 | Manufacturing | Presswork |
| British Aeroplane Syndicate Ltd | British Aeroplane Syndicate | 1 | Aircraft Manufacturers | |
| British Oxygen Co Ltd | British Oxygen | 22 | Gases | Oxygen |
| British Ropes Ltd | British Ropes | 1 | Materials | Wire |
| British Aeroplane Syndicate Ltd | BritishAeroplaneSyndicate | 1 | Aircraft Manufacturers | |
| British Aeroplane Varnish Co Ltd. The | BritishAeroplaneVarnish | 1 | Finishes | Varnishes |
| British Aircraft Manufacturing Co Ltd | BritishAircraft | 50 | Aircraft Manufacturers | |
| British Aircraft Manufacturing Co. The | BritishAircraftMFGCo | 2 | Aeronautical Engineers | Components |
| British Airships Ltd | BritishAirships | 5 | Aircraft Manufacturers | Airships |
| British Airways Ltd | BritishAirways | 26 | Air Transport | Airlines |
| British Aluminium Co Ltd | BritishAluminium | 188 | Materials | Aluminium |
| British Anodising Ltd | BritishAnodising | 14 | Finishes | Aluminium Alloys |
| British Artid Plastics Ltd | BritishArtid | 2 | Materials | Plastics |
| British Manufactured Bearings Co Ltd | BritishBearings | 22 | Components | Bearings |
| British Belting & Asbestos Ltd | BritishBelting | 4 | Materials | Asbestos |
| British Bentwood Co Ltd | BritishBentwood | 2 | Manufacturing | Woodworking |
| British Cellulose & Chemical Manufacturing Co Ltd | BritishCellulose | 9 | Finishes | Dope |
| British Chuck & Piston Ring Co Ltd | BritishChuck | 2 | Components | Piston Rings |
| British Continental Airways | BritishContinental | 3 | Air Transport | Airlines |
| British Eagle International Airlines | BritishEagle | 3 | Air Transport | Airlines |
| British Ebonite Co Ltd. The | BritishEbonite | 1 | Materials | Ebonite |
| British Emulsifiers Ltd | BritishEmulsifiers | 7 | Fabrication | Sheet Metal Work |
| British Engraving & Nameplate Manufacturing Co. The | BritishEngraving | 6 | Finishes | Engraving |
| British Ermeto Corporation Ltd | BritishErmeto | 19 | Manufacturing | Valves |
| British Furnaces Ltd | BritishFurnaces | 1 | Engineering Equipment | Furnaces |
| British Glues & Chemicals Ltd | BritishGlues | 2 | Chemicals | Adhesives |
| British Hydrogen Co | BritishHydrogen | 1 | Gases | Hydrogen |
| British Instrument Co Ltd | BritishInstrument | 5 | Instrument Manufacturers | Anti-Stall Gear |
| British Landing Gears Ltd | BritishLandingGears | 1 | Components | Landing Gear |
| British M.A.R.C Ltd | BritishMARC | 7 | Manufacturing | Precision Engineering |
| British Maxium Ltd | BritishMaxium | 11 | Materials | Magnesium Alloys |
| British Metal (Kingston) Ltd | BritishMetalK | 12 | Manufacturing | Sheet Metal Work |
| The British Monogram Oil Co Ltd | BritishMonogram | 1 | Lubricant Suppliers | Oil |
| British MonoRail Ltd | BritishMonoRail | 2 | Engineering Equipment | Cranes |
| British Motor Castings | BritishMotorCast | 2 | Manufacturing | Castings |
| The British N.A.G. Motor Company | BritishNAG | 2 | Engine Manufacturers | |
| British N.S.F. Ltd | BritishNSF | 2 | Testing | Test Equipment |
| British Oxygen Co | BritishOxygen | 42 | Gases | Hydrogen |
| British Oxygen Aro Equipment Ltd | BritishOxygenAro | 25 | Gases | Oxygen |
| British Paints Ltd | BritishPaints | 44 | Finishes | Paints |
| British Parachute Co Ltd | BritishParachute | 8 | Survival Equipment | Parachutes |
| British Plywood Manufacturers Ltd | BritishPlywood | 9 | Fabrication | Woodworking |
| British Power Boat Company Ltd | BritishPowerBoat | 134 | Watercraft | Launches And Tenders |
| British Pressed Panels Ltd | BritishPressedPanels | 1 | Manufacturing | Presswork |
| British Reinforced Concrete Engineering Co Ltd. The | BritishReinforcedConcrete | 26 | Airfields | Construction |
| British Rola Co Ltd | BritishRola | 1 | Manufacturing | Presswork |
| British Ropes Ltd | BritishRopes | 10 | Materials | Rope |
| British Runways Ltd | BritishRunways | 1 | Airfields | Runways |
| British & Russian Commercial Co Ltd. The | BritishRussian | 1 | Chemicals | Adhesives |
| British School Of Flying | BritishSchoolOfFlying | 4 | Training | Flying School |
| British Steel Wool Co Ltd | BritishSteelWool | 1 | Factory | Steel Wool |
| British Steelwork Association | BritishSteelwork | 3 | Structures | ARP |
| British Wright Co Ltd | BritishWright | 7 | Instrument Manufacturers | Flight Instruments |
| Britool | Britool | 54 | Engineering Equipment | Hand Tools |
| Britten-Norman. Fairey | BrittenNorman | 51 | Aircraft Manufacturers | |
| Broadway Engineering Compnay | BroadwayEngineering | 1 | Engineering Equipment | Machine Tools |
| Brockhouse Castings Ltd | Brockhouse | 38 | Materials | Steel |
| Brocklin Ltd | Brocklin | 1 | Manufacturing | Extrusions |
| Brockworth Engineering | BrockworthEng | 1 | Factory | |
| Brodie-Kent Meters | BrodieKent | 8 | Ground Equipment | Fuel Meters |
| Brolt Ltd | Brolt | 1 | Components | Electrical |
| Brompton Engineering Co | BromptonEngineering | 2 | Manufacturing | Parts |
| Brook Motors Ltd | Brook | 7 | Components | Electrical |
| Brooke Tool Manufacturing Co Ltd | BrookeTool | 2 | Engineering Equipment | Machine Tools |
| Herbert Spencer Flying School | Brooklands | 70 | Airfields | Flying School |
| Brooklands Aviation Ltd | BrooklandsAviation | 70 | Training | Flying School |
| Brown Brothers Ltd | Brown Brothers |
548 | Manufacturing | AGS |
| Brown & Barlow Ltd | BrownBarlow | 2 | Components | Carburetters |
| Brown Bayleys Steels Ltd | BrownBayleys | 1 | Materials | Steel |
| British Brown-Boveri Ltd | BrownBoveri | 1 | Manufacturing | Wind Tunnels |
| Browne & Co Ltd | BrowneCo | 1 | Finishes | Varnishes |
| Bruntons | Bruntons | 15 | Fixtures and Fittings | AGS |
| Brush Instruments | Brush | 4 | Instrument Manufacturers | Test Equipment |
| Bryans Aeroquipment Ltd | BryansAeroquip | 89 | Engineering Equipment | Test Equipment |
| Brymon Aviation Ltd | Brymon | 1 | Air Transport | |
| Birmingham Small Arms Co Ltd. The | BSA | 1 | Manufacturing | Forging |
| British South American Airways. B.S.A.A. | BSAA | 10 | Air Transport | Airlines |
| B.S.T Aeronautical Ltd | BSTAeronautical | 8 | Aircraft Parts | Aircraft Spares |
| British Thomson-Houston Co Ltd | BTH | 216 | Components | Magnetos |
| BTR Industries Ltd | BTR | 1 | Aircraft Parts | Suppliers |
| British United Airways | BUA | 25 | Recruitment | Engineering |
| Bucker-Flugzeugbau GMBH | Bucker | 5 | Aircraft Manufacturers | Non UK |
| Budenburg Gauge Co Ltd | Budenburg | 1 | Engineering Equipment | Gauges |
| Buffalo Forge Company Ltd | BuffaloForge | 7 | Factory | Air Conditioning |
| Building Construction Co Ltd | BuildingConstruction | 2 | Structures | Factory |
| Bulgin. A.F. | Bulgin | 1 | Components | Electrical |
| Bullivant and Co Ltd | Bullivant | 2 | Ground Equipment | Lifting Tackle |
| Bulpitt & Sons Ltd | Bulpitt | 1 | Manufacturing | Components |
| Bulte | Bulte | 1 | Aircraft Manufacturers | Non UK |
| Bunce & Son. Willaim | Bunce | 1 | Airfields | Snow Clearance |
| Buncher & Haseler Ltd | BuncherHaseler | 1 | Manufacturing | Spinners |
| Burberrys | Burberrys | 109 | Clothing | Uniforms |
| Burchs | Burchs | 26 | Clothing | Uniforms |
| Burgess Industries (England) | BurgessIndustries | 8 | Manufacturing | Components |
| Burley Limited | Burley | 11 | Materials | Rubber |
| Burndept Ltd | Burndept | 41 | Avionics | Radio |
| Burnett & Co Ltd. Sir Wm | Burnett | 4 | Chemicals | Soldering |
| Burney & Blackburne Ltd | BurneyBlackburne | 4 | Engine Manufacturers | |
| Burnley Aircraft Products Ltd | BurnleyAircraftProducts | 73 | Maintenance | Aircraft |
| Burroughs Wellcome & Co | BurroughsWellcome | 39 | Health And Safety | First Aid |
| Burton Aircraft & Manufacturing Co | BurtonAircraft | 3 | Aircraft | Engineering |
| Burtonwood Motor & Aircraft Engineering Company Ltd | BurtonWood | 2 | Aircraft | Engineering |
| Bury Felt Manufacturing Co Ltd | BuryFelt | 6 | Manufacturing | Felt |
| Burys & Company Ltd | Burys | 1 | Materials | Steel |
| Bushing Company Ltd. The | Bushing | 2 | Components | Bearings |
| Butlers Ltd | Butlers | 4 | Communications | Electrical |
| Butted Tube Co Ltd. The Patent | ButtedTube | 2 | Manufacturing | Tubing |
| British Vacuum Cleaner & Engineering Co Ltd. The | BVC | 2 | Engine Manufacturers | Vacuum Cleaners |
| BWIA | BWIA | 1 | Recruitment | Airlines |
| British Wire Products Ltd | BWP | 30 | Components | Controls |
| BX Plastics Ltd | BXPlastics | 9 | Materials | Plastics |
| Byson Appliance Co Ltd | Byson | 2 | Materials | Bakelite |
