| Hames Associates Limited | Administrative & support | 2004 |
| Hamish Muir Limited | Information & communication | 2001 |
| Hamlin Developments Limited | Construction | 2016 |
| Hamlin Property Developers Limited | Real estate | 2019 |
| Hammonds Mead Limited | Households | 1997 |
| Hampton MX Practice Track Ltd | Arts & recreation | 2021 |
| Hamslade Green Management Company Limited | Households | 2017 |
| Handy Helen Ltd | Construction | 2026 |
| Handyperson Services Limited | Construction | 2026 |
| Hangover Prevention Company Ltd | Wholesale & retail | 2013 |
| Hanmor Limited | Professional & scientific | 2023 |
| Hanover Forbes Limited | Professional & scientific | 2013 |
| Hanuara Investments Ltd | Financial services | 2013 |
| Hanwick Plumbing Limited | Construction | 2012 |
| Happyard Ltd | Agriculture & fishing | 2020 |
| Harbour Innovations Limited | Construction | 2007 |
| Harbour Media Limited | Education | 2019 |
| Harbour Properties SW Limited | Real estate | 2023 |
| Harbourside Holidays (Weymouth) Limited | Hospitality | 2021 |
| Hardmet Associates Ltd | Manufacturing | 2003 |
| Hardmet Landforce Limited | Agriculture & fishing | 2009 |
| Hardy Green Limited | Administrative & support | 2014 |
| Hardy Tree Surgeons Limited | Agriculture & fishing | 2002 |
| Hardy's Holiday Home Services Ltd | Hospitality | 2020 |
| Hark and Lark Ltd | Professional & scientific | 2025 |
| Harmony Music (Dorchester) Ltd | Wholesale & retail | 2021 |
| Harnham Properties Limited | Real estate | 2004 |
| Harold Doonan Building Materials Limited | Wholesale & retail | 2001 |
| Harraden Properties Limited | Real estate | 1961 |
| Harriet Glen Creations Ltd | Arts & recreation | 2013 |
| Harrison Electrical (Southern) Limited | Construction | 2014 |
| Harrison Lloyd Developments Limited | Real estate | 2025 |
| Harry Houses Ltd | Hospitality | 2023 |
| Hart and Hops Limited | Hospitality | 2013 |
| Harvey Farms Contracting Ltd | Administrative & support | 2002 |
| Harveys Engineering Limited | Construction | 2016 |
| Harwell Sport Limited | Professional & scientific | 2020 |
| Haven Campus Holdings Limited | Financial services | 2025 |
| Haven Campus Ltd | Real estate | 2023 |
| Haven Hearing Limited | Wholesale & retail | 2026 |
| Hawthorn Cove Ltd | Professional & scientific | 2026 |
| Hcsm Limited | Professional & scientific | 2015 |
| HD Dorset Nails Ltd | Other services | 2022 |
| Healing Healer Limited | Health & social care | 2014 |
| Hearn Group Contracts Ltd | Construction | 2012 |
| Hearn Group Limited | Construction | 2011 |
| Hearn Group Roofing Solutions Ltd | Construction | 2024 |
| Heatcare (UK) Limited | Construction | 2001 |
| Heathlands Veterinary Hospital Limited | Professional & scientific | 2002 |
| Heatwise P&H Limited | Construction | 2024 |
| Hebdomeros Limited | Information & communication | 2023 |
| Hectare Agritech Limited | Information & communication | 2012 |
| Hedgerows Management Ltd | Households | 1999 |
| Hedleys Wine Bars Limited | Hospitality | 2020 |
| Helen E Carr Ltd | Health & social care | 2024 |
| Helen Mews Weymouth Management Limited | Households | 2015 |
| Helen Toft Ltd | Professional & scientific | 2008 |
| Heliostudio Ltd | Arts & recreation | 2021 |
| Heliport UK Ltd | Extraterritorial | 2023 |
| Helix Ecology Ltd | Professional & scientific | 2025 |
| Hellenic European Leadership Council | Education | 2021 |
| Hello Car Wash Ltd | Administrative & support | 2025 |
| Helping Hands in Rural Dorset Limited | Health & social care | 2019 |
| Henchard Court Dorchester Limited | Households | 1989 |
| Henocq Holdings Ltd | Financial services | 2024 |
| Henosis Capital Limited | Financial services | 2016 |
| Henstridge Hangar Services LLP | | 2024 |
| Hentom Electrical Ltd | Construction | 2024 |
| Herb & Hedgerow Limited | Information & communication | 2012 |
| Heritage (Weymouth) Ltd | Hospitality | 2009 |
| Heritage Touring Ltd. | Administrative & support | 1988 |
| Hermanf Limited | Administrative & support | 2017 |
| Hermitage 18A Lagland Street Limited | Households | 2026 |
| Herrison Heights Management Company Limited | Real estate | 2004 |
| Hestia Gate Ltd | Construction | 2024 |
| HFB Puddletown (Management) Ltd | Households | 2008 |
| HGC IT Solutions Limited | Information & communication | 2025 |
| Hickory Tree Limited | Real estate | 2021 |
| Hidden Valley Dorset Ltd | Agriculture & fishing | 2024 |
| Higan Ltd | Manufacturing | 2020 |
| Higgy's Electrical Services Limited | Construction | 2018 |
| High House Farm Limited | Agriculture & fishing | 1946 |
| High Pine Music Limited | Education | 2026 |
| High Trees Broadmayne Limited | Real estate | 2024 |
| Highclere Consultancy Limited | Other services | 2011 |
| Highdown Avenue (Poundbury) Management Company Limited | Households | 2002 |
| Higher Ground Meadow Ltd | Other services | 2013 |
| Highgrove Lettings Limited | Real estate | 2003 |
| Highland Investments Limited | Real estate | 1996 |
| Highmoor Homes Limited | Real estate | 2004 |
| Highwall Lincoln Limited | Real estate | 2022 |
| Highways News Ltd | Information & communication | 2020 |
| Highwood Limited | Wholesale & retail | 2001 |
| Hill Barn Farm Ltd | Agriculture & fishing | 2025 |
| Hill Fencing Limited | Manufacturing | 2010 |
| Hill Thatch Health Limited | Health & social care | 2023 |
| Hillcrest Kennels Limited | Administrative & support | 2012 |
| Hillfort Close Residents Management Company Limited | Real estate | 1978 |
| Hillmeadow Properties Ltd | Real estate | 2021 |
| Hillside Welding Ltd | Manufacturing | 2022 |