| Dominik Wood Solutions Limited | Wholesale & retail | 2025 |
| Dominique Thornton Racing Limited | Arts & recreation | 2023 |
| Dominus Capital Limited | Wholesale & retail | 2025 |
| Domis Construction Group Ltd | Construction | 2024 |
| Domort Limited | Wholesale & retail | 2025 |
| Doms Dings and Dents Ltd | Wholesale & retail | 2025 |
| Domus Construction (Yorkshire) Ltd | Construction | 2021 |
| Domus One Ltd | Real estate | 2025 |
| DON & Anna Transport Ltd | Transport & logistics | 2018 |
| DON Industrial Supplies Limited | Wholesale & retail | 1982 |
| DON Real Estate Ltd | Real estate | 2025 |
| DON Richman Ltd | Health & social care | 2018 |
| DON Station Limited | Hospitality | 2024 |
| DON Valley Brewery Ltd | Manufacturing | 2017 |
| DON Valley Cycles Ltd | Wholesale & retail | 2003 |
| DON Valley Developments Limited | Construction | 2017 |
| DON Valley Engineering Company Limited | Manufacturing | 1947 |
| DON Valley Engineering Construction Limited | Construction | 1999 |
| DON Valley Engineering Holdings Limited | Financial services | 2010 |
| DON Valley Materials Handling Limited | Mining & quarrying | 2020 |
| DON Valley Mechanical Solutions Limited | Construction | 2024 |
| DON Valley Medical Services Limited | Health & social care | 2014 |
| DON Valley Properties Ltd | Construction | 2021 |
| DON Valley Turf Ltd | Administrative & support | 2018 |
| Don'T Feed the Bears Limited | Wholesale & retail | 2018 |
| Donaldson Properties (Whitby) Limited | Real estate | 2025 |
| Donasonic Automation Ltd | Manufacturing | 2014 |
| Donbac Limited | Financial services | 1998 |
| Doncast Limited | Hospitality | 1989 |
| Doncaster & Bassetlaw Healthcare Services Ltd | Health & social care | 2018 |
| Doncaster & District Model Engineering Society Limited | Arts & recreation | 2000 |
| Doncaster & South Humberside Swim School LLP | | 2016 |
| Doncaster Afro Caribbean Community Hub CIC | Health & social care | 2024 |
| Doncaster Alarms Limited | Construction | 2017 |
| Doncaster ALL Trades Ltd | Administrative & support | 2022 |
| Doncaster and District Youth Football League Limited | Arts & recreation | 2021 |
| Doncaster Antenna Communications Limited | Information & communication | 2014 |
| Doncaster Art Fair Ltd | Wholesale & retail | 2018 |
| Doncaster Athletic Club | Arts & recreation | 2006 |
| Doncaster Auction Centre Ltd | Wholesale & retail | 2022 |
| Doncaster Automotive Glass Ltd | Wholesale & retail | 2020 |
| Doncaster Barber Ltd | Other services | 2026 |
| Doncaster Bathrooms Limited | Construction | 2019 |
| Doncaster Belles CIC | Arts & recreation | 2025 |
| Doncaster Caravan Storage Ltd | Other services | 2013 |
| Doncaster Cargo Logistics Ltd | Transport & logistics | 2025 |
| Doncaster Carpets and Flooring Limited | Wholesale & retail | 2022 |
| Doncaster Carr Management Limited | Real estate | 2005 |
| Doncaster Cash & Carry Ltd | Wholesale & retail | 2024 |
| Doncaster Cash Registers Limited | Administrative & support | 2003 |
| Doncaster Central Development Trust CIC | Real estate | 2008 |
| Doncaster Central Learning Centre CIC | Education | 2010 |
| Doncaster Centre for Basic Skills and Dyslexia Limited | Education | 2004 |
| Doncaster Chamber of Commerce and Enterprise | Administrative & support | 1941 |
| Doncaster City Football Academy Ltd | Administrative & support | 2022 |
| Doncaster City Football Club Ltd | Arts & recreation | 2022 |
| Doncaster College | Education | 2018 |
| Doncaster Community Boathouse Trust | Professional & scientific | 2004 |
| Doncaster Computer Games Limited | Wholesale & retail | 2010 |
| Doncaster Conferences, Catering and Events Limited | Hospitality | 2002 |
| Doncaster Consort House Limited | Real estate | 2017 |
| Doncaster Counselling Services Limited | Health & social care | 2025 |
| Doncaster Culture and Leisure Trust | Arts & recreation | 2002 |
| Doncaster Development DEN CIC | Education | 2026 |
| Doncaster Diagnostic Centre (Doncaster) Limited | Wholesale & retail | 2010 |
| Doncaster Discount Store Limited | Wholesale & retail | 2024 |
| Doncaster DRY GIN Limited | Manufacturing | 2018 |
| Doncaster Drylining Ltd | Construction | 2015 |
| Doncaster Drywall Solutions Limited | Construction | 2018 |
| Doncaster Eats Ltd | Administrative & support | 2026 |
| Doncaster Electrician Ltd | Construction | 2021 |
| Doncaster Emporium Limited | Wholesale & retail | 2015 |
| Doncaster Endodontics Ltd | Wholesale & retail | 2020 |
| Doncaster Estates Ltd | Real estate | 2021 |
| Doncaster Ethnic Minority Regeneration Partnership | Education | 2003 |
| Doncaster Flooring Limited | Wholesale & retail | 2025 |
| Doncaster Food & Drink Limited | Wholesale & retail | 2018 |
| Doncaster Food and Wine Mini Market Limited | Wholesale & retail | 2018 |
| Doncaster Food and Wine Store Limited | Wholesale & retail | 2018 |
| Doncaster Foodbank (Trussell Trust) Ltd | Health & social care | 2016 |
| Doncaster Fresh Meat Ltd | Wholesale & retail | 2024 |
| Doncaster Fried Chicken Ltd | Hospitality | 2022 |
| Doncaster Friendly Shop Ltd | Wholesale & retail | 2026 |
| Doncaster Funerals Ltd | Other services | 2019 |
| Doncaster Garden Buildings Limited | Wholesale & retail | 2012 |
| Doncaster GAS Products Ltd | Wholesale & retail | 2021 |
| Doncaster GAS Training and Assessment Centre Limited | Administrative & support | 2005 |
| Doncaster Glass & Glazing Limited | Manufacturing | 1996 |
| Doncaster Golf Driving Range Limited | Arts & recreation | 2007 |
| Doncaster Golf Range Ltd | Arts & recreation | 2013 |
| Doncaster Grab Hire Limited | Transport & logistics | 2016 |
| Doncaster Grand Theatre Trust | Other services | 2008 |
| Doncaster Grill Limited | Hospitality | 2023 |
| Doncaster Groundworks & Reinforcements Ltd | Construction | 2012 |
| Doncaster Gymnastics Academy Ltd | Arts & recreation | 2010 |
| Doncaster Healthwatch CIC | Information & communication | 2016 |
| Doncaster Heating & GAS Ltd | Construction | 2026 |
| Doncaster Heating Ltd | Construction | 2019 |
| Doncaster Heating Solutions Ltd | Construction | 2015 |
| Doncaster Home and Lettings Ltd | Real estate | 2025 |