Chemical, Oil & Gas Company Index - H
- H and R ChemPharm (UK) Ltd - Tipton
- H E Charlton & Son Ltd. - Sale
- H K L Gas Power Ltd. - Birmingham
- H O S E International Ltd. - Aberdeen
- H R Wallingford Group Ltd. - Wallingford
- H S Pipequipment Ltd. - Thatcham
- H2O Chemicals Ltd. - Leeds
- Hach Lange Ltd - Salford
- Hall Analytical Laboratories Ltd. - Manchester
- Hammerite Products Ltd. - Prudhoe
- Hammond Chemicals Ltd. - Brierley Hill
- Hampshire (R & D Glassware) Ltd - Southampton
- Hampton Works (Stampings) Ltd. - Birmingham
- Hamworthy Combustion Engineering Ltd. - Poole
- Handa Fine Chemicals Ltd - Nottingham
- Hanover Company - Aldridge
- Hardide Coatings Ltd - Bicester
- Harland Simon UPS Ltd - Milton Keynes
- Harp International Ltd. - Pontypridd
- Harrison Oils Ltd - Preston
- Harrowfell Ltd. - Aberdeen
- HAT International Ltd - Nelson
- Haven Automation Ltd. - Swansea
- Hawks Scientific Ltd - Hyde
- Hayman Ltd. - Witham
- HazChem Systems Ltd - Ashton under Lyne
- Hazell Engineering Ltd. - London
- Haztec - Edgware
- HCC Protective Coatings Ltd - Colchester
- HCS Control Systems - Glenrothes
- Heat Transfer Systems Ltd - High Peak
- Helapet Ltd - Dunstable
- Hendor-Pe UK Ltd - Manchester
- Henkel Ltd - Winsford
- Henkel Ltd (Loctite) - Hemel Hempstead
- Henleycraft Ltd. - Portsmouth
- Hexion Speciality Chemicals - Penarth
- Hh Valves Ltd. - Wigan
- Hi-Fi Industrial Film Ltd. - Stevenage
- Hi-Flow Valves Ltd. - Bury St Edmunds
- Hi-Spec Lubricants Ltd. - Gateshead
- Hibiscus Plc - Leeds
- Hichrom Ltd - Reading
- High Force Research Ltd - Durham
- High Tech Tubes Ltd - Byfleet
- High Tensile Stainless Ltd - Sheffield
- Highnett Controls - Newbury
- Hilton Instruments Ltd. - Aberdeen
- Hima-Sella Ltd - Stockport
- Hiretec UK - GPS Rentals - Norwich
- Hitech EMS Ltd - Grantham
- HITEK Electronic Materials Ltd - Scunthorpe
- HMT Rubbaglas Ltd - Bromley
- Hochiki Europe (U K ) Ltd. - Gillingham
- Hockway Ltd - Redhill
- Hoerbiger Rings and Packings Ltd - Bradford
- Hogg Builders (York) Ltd. - York
- Hogg Engineering Ltd. - North Shields
- Hoh Oilfield Services Ltd. - High Wycombe
- Holdtite Adhesives Ltd - Chester le Street
- Holland Heating (U K) Ltd. - Leatherhead
- Holley Trevor & Jane - Stowmarket
- Holt Lloyd Ltd - Stockport
- Hone-All Precision Ltd - Leighton Buzzard
- Honeywill and Stein Ltd - Sutton
- Horiba Instruments Ltd - Northampton
- Hornett Bros & Co. Ltd. - Rainham
- Hortifeeds Direct Ltd - Lincoln
- Houghton Forestry Services - Ulverston
- Houghton Plc - Manchester
- Houlder Ltd. - London
- Howden Process Compressors - Chesterfield
- HPR (UK) Ltd - Insch
- Huddersfield Valves Ltd - Bradford
- Hunting Energy Services Ltd. - Aberdeen
- Hunting Plc - London
- Huntingdon Fusion Techniques Ltd - Llanelli
- Huntingdon Life Sciences Ltd - Huntingdon
- Huntsman Corporation U K Ltd. - Llanelli
- Hutchinson David - Scarborough
- Hutton & Co. (Ships Chandlers) Ltd. - Hull
- HVAC and Refrigeration Engineering Ltd - Aberdeen
- Hydra International Ltd - Milton Keynes
- Hydra Technologies Ltd - Swansea
- Hydrachem Ltd - Billingshurst
- Hydrafit Subsea UK Ltd - Aberdeen
- Hydralectric Ltd. - West Byfleet
- Hydraulic Analysis Group Ltd. - Leeds
- Hydro Projects Ltd. - Norwich
Hydron Protective Coatings Ltd - Wolverhampton- Hylomar Ltd - Wigan