| NO 2 ST Margarets Road (Torquay) Management Company Limited | Households | 2004 |
| NO Name Collective Ltd | Information & communication | 2025 |
| Noctics Ltd | Wholesale & retail | 2026 |
| Noda's Waffles Ltd | Other services | 2019 |
| Nolan Commercial Ltd | Real estate | 2025 |
| Norbiton Food and Wine Limited | Wholesale & retail | 2011 |
| Nordic Real Estate Invest Ltd | Real estate | 2019 |
| Norman Brooking Builders Limited | Construction | 2007 |
| Northcote Lane Amenity Ltd | Real estate | 2017 |
| Northern Hospitality Limited | Hospitality | 2022 |
| Northernsouluk Ltd | Manufacturing | 2015 |
| Nostalgic Transport Limited | Transport & logistics | 2002 |
| NOT a Jewellery Box Ltd | Wholesale & retail | 2013 |
| NOT Just Another Community CIC | Education | 2023 |
| NOT Just Beds (SW) Ltd | Wholesale & retail | 2023 |
| Nova Reach Ltd | Professional & scientific | 2025 |
| Novaya Luna Limited | Health & social care | 2013 |
| NP Consultancy Services Limited | Administrative & support | 2019 |
| NPC Carpenters (SW) Limited | Other services | 2017 |
| Nsnr Limited | Information & communication | 1996 |
| Nsueferrer Limited | Health & social care | 2025 |
| NUC Association | Health & social care | 2017 |
| NUE Construction Limited | Construction | 2022 |
| NUE Generation Limited | Energy | 2022 |
| Nugent (SW) Limited | Real estate | 1998 |
| Number 8 Barnpark Terrace Teignmouth Management Company Limited | Households | 1986 |
| Number Nine Studios South West Ltd | Wholesale & retail | 2025 |
| NWC Torquay Ltd | Administrative & support | 2024 |
| Nxtgen Trading Ltd | Wholesale & retail | 2025 |
| O & H Electrical Limited | Construction | 2008 |
| O.F.B Roofing Limited | Construction | 2023 |
| O.P.D Limited | Professional & scientific | 2002 |
| O.V.C. Management Limited | Real estate | 2003 |
| Oak Meadow Amenity Management Company Limited | Households | 2007 |
| Oak Mount (Hemyock) Management Company Limited | Construction | 2021 |
| Oakdene Flats Management Limited | Households | 1983 |
| Oaklawn Court (Torquay) Limited | Households | 1973 |
| Oakridge (Torquay) Management Company Limited | Hospitality | 1993 |
| Oakwood Advisory and Coaching Limited | Professional & scientific | 2015 |
| Oakwood Residential Projects Limited | Construction | 2025 |
| Oakwood Specialist Services Limited | Administrative & support | 2013 |
| Obey the Hustle Ltd | Wholesale & retail | 2025 |
| Obtain Electrical Services Limited | Construction | 2023 |
| Ocean AI Limited | Information & communication | 2022 |
| Ocean Breeze Amenities Ltd | Real estate | 2015 |
| Ocean Gate Management (Brixham) Limited | Households | 2022 |
| Ocean Reach (Holiday Rentals) Limited | Hospitality | 2017 |
| Ocean Reach Management Company Limited | Households | 2017 |
| Ocean View (Torquay) Residents Management Company Ltd | Households | 2022 |
| Ocean View Cleveland Road (Management Company) Limited | Households | 1999 |
| Oceancrest Holdings Ltd | Real estate | 2026 |
| Oceaneye Marine Ltd | Professional & scientific | 2024 |
| Oceans Restaurant Limited | Hospitality | 2016 |
| Oddicombe Property Limited | Real estate | 2026 |
| Offshore Bars UK Limited | Hospitality | 2015 |
| Ohmt Services Limited | Professional & scientific | 2026 |
| Oikku Ltd | Wholesale & retail | 2020 |
| OIL Applications Ltd | Wholesale & retail | 2004 |
| Okey Dokey Developments Limited | Real estate | 2026 |
| Okrcb.Int Ltd | Wholesale & retail | 2024 |
| Old Customs House Limited | Professional & scientific | 2016 |
| Old Foundry Court (Brixham) Management Company Limited | Households | 2007 |
| Old Skools Cafe & Bar Limited | Hospitality | 2011 |
| Old Vienna Restaurant Torquay Limited | Hospitality | 2010 |
| Olde World Inns (Dunster 2012) Holdings Ltd | Financial services | 2019 |
| Olde World Inns (Dunster 2012) Limited | Hospitality | 2012 |
| Oldway Electrical Services Limited | Other services | 2003 |
| Olive Care 24/7 Ltd | Health & social care | 2021 |
| Oliver Long Limited | Information & communication | 2016 |
| Ombak Ltd | Information & communication | 2025 |
| Omega Trade Frames Limited | Manufacturing | 1997 |
| Omero Tarquini Ltd. | Arts & recreation | 2018 |
| Omt-Working Group Ltd | Information & communication | 2025 |
| Omza Holdings Ltd | Hospitality | 2025 |
| ON IT Consulting Ltd | Information & communication | 2022 |
| ON Tour Catering Ltd | Hospitality | 2026 |
| One Seven Eight ST Marychurch Limited | Households | 2015 |
| One Vision One Fitness Ltd | Arts & recreation | 2007 |
| Onlearn Ltd | Information & communication | 2019 |
| Online Fire Protection Limited | Public administration | 2025 |
| Onpoint Beauty Limited | Other services | 2023 |
| Opalmedia Ltd | Information & communication | 2021 |
| Opalven Ltd | Information & communication | 2021 |
| Openip Consulting Limited | Information & communication | 2022 |
| Optics Warehouse Limited | Wholesale & retail | 2007 |
| Optimal Services Maintenance Limited | Manufacturing | 2025 |
| Orange Care - Grange LEA Limited | Health & social care | 2016 |
| Orange Care Limited | Health & social care | 2015 |
| Orange Care Restgarth Limited | Health & social care | 2023 |
| Orange Island Holdings Ltd | Financial services | 2024 |
| Orange Island Leisure Ltd | Other services | 2023 |
| Orchard House (Teignmouth) Ltd | Households | 2012 |
| Orchard House Reporting Ltd | Health & social care | 2024 |
| Orchard Mews (Torquay) Management Company Limited | Households | 2018 |
| Orchard Stores Limited | Wholesale & retail | 2019 |
| Orchid Atlas Studio Ltd | Information & communication | 2025 |
| Orestone Drive (Maidencombe) Management Company Limited | Households | 1998 |
| Orestone Investments Limited | Real estate | 2019 |
| Orestone Wealth Management Limited | Financial services | 2017 |
| Oriental Torquay Limited | Hospitality | 2023 |