| Oenos, LLCBerwyn Heights, MD, United States · USchecked 2 Nov 2026 | US | 0 | – | – | – | – | – |
| Oenotria CorpWeston, FL, United States · USchecked 2 Nov 2026 | US | 0 | – | – | – | – | – |
| Off Piste Wines LtdLondon, United Kingdom · UKoffpistewines.com · checked 2 Nov 2026 | UK | 0 | – | – | –Premium (producers) | – | 2006 |
| Off-Vintage LLCNew York, NY, United States · USchecked 2 Nov 2026 | US | 0 | – | – | – | – | – |
| Offdrywines LtdLondon, United Kingdom · UKchecked 2 Nov 2026 | UK | 0 | – | – | – | – | 2024 |
| Offshore Water Management LtdWesthill, United Kingdom · UKchecked 2 Nov 2026 | UK | 0 | – | – | – | – | 2008 |
| Ohme Operations UK LimitedLondon, United Kingdom · UKchecked 2 Nov 2026 | UK | 0 | – | – | – | – | 2019 |
| Ohmrone Wine & Liquor LLCDayton, NJ, United States · USchecked 2 Nov 2026 | US | 0 | – | – | – | – | – |
| Okanagan Roots LtdLondon, United Kingdom · UKokanaganroots.co.uk · checked 2 Nov 2026 | UK | 0 | – | – | – | – | 2019 |
| Olamendi's Gourmet Foods, Inc.San Juan Capistrano, CA, United States · USchecked 2 Nov 2026 | US | 0 | – | – | – | – | – |
| Olcus LimitedLondon, United Kingdom · UKchecked 2 Nov 2026 | UK | 0 | – | – | – | – | 2021 |
| Old Butcher's Wine Cellar LimitedCookham, United Kingdom · UKoldbutcherswinecellar.co.uk · checked 2 Nov 2026 | UK | 0 | – | – | – | – | 2012 |
| Old Chapel CellarsExeter, United Kingdom · oldchapelcellars.co.uk · checked 1 Nov 2026 | | – | 46 | France, Italy, AustraliaTerre Siciliane, Stellenbosch | –Mid (producers) | 9% | 2020 |
| Old Liquors, Inc.Davie, FL, United States · USchecked 2 Nov 2026 | US | 0 | – | – | – | – | – |
| Old Reserve Enterprise LLCKalispell, MT, United States · USchecked 2 Nov 2026 | US | 0 | – | – | – | – | – |
| Old Rook Imports, Inc.Leesburg, Va, VA, United States · USchecked 2 Nov 2026 | US | 0 | – | – | – | – | – |
| Old Town Commerce, Inc.Chicago, IL, United States · USchecked 2 Nov 2026 | US | 0 | – | – | – | – | – |
| Old World Wine Co., LLCDenver, CO, United States · oldworldwineco.com · checked 29 Oct 2026 | | – | 102 | France, Italy, SpainSancerre, Fleurie | –Premium (producers) | 25% | – |
| Old York Enterprises, LLCClinton, NY, United States · USchecked 2 Nov 2026 | US | 0 | – | – | – | – | – |
| Oldbourne & Oldbourne Hospitality LimitedLondon, United Kingdom · UKchecked 2 Nov 2026 | UK | 0 | – | – | – | – | 2015 |
| Olive Harvest, LLCShrewsbury, MA, United States · USchecked 2 Nov 2026 | US | 0 | – | – | – | – | – |
| Oliver and Bird LtdPaignton, United Kingdom · UKoliverandbird.co.uk · checked 2 Nov 2026 | UK | 0 | – | – | – | – | 2004 |
| Oliver Burridge & Co LtdLondon, United Kingdom · UKchecked 2 Nov 2026 | UK | 0 | – | – | – | – | 1937 |
| Olivers Beer and Wine LtdMinster, United Kingdom · UKchecked 2 Nov 2026 | UK | 0 | – | – | – | – | 2005 |
| Oliveto & Olivo LtdLondon, United Kingdom · UKchecked 2 Nov 2026 | UK | 0 | – | – | – | – | 1982 |
| Olympia Imports LLCFort Myers, FL, United States · USchecked 2 Nov 2026 | US | 0 | – | – | – | – | – |
| Olympia Wine Import, LLCCape Coral, FL, United States · USchecked 2 Nov 2026 | US | 0 | – | – | – | – | – |
| Olympic View CafeBainbridge Island, WA, United States · USchecked 2 Nov 2026 | US | 0 | – | – | – | – | – |
| Olympus Mons ASAsker, Norway · NO1-4 employees · checked 2 Nov 2026 | NO | 0 | – | – | – | – | 2013 |
| Omb Tax LimitedTunbridge Wells, United Kingdom · UKchecked 2 Nov 2026 | UK | 0 | – | – | – | – | 2003 |
| Omniawine LtdWoodford Green, United Kingdom · UKchecked 2 Nov 2026 | UK | 0 | – | – | – | – | 2023 |
| Omze Authentic Tequila, Mezcal & Spirits, IncPembroke, MA, United States · USchecked 2 Nov 2026 | US | 0 | – | – | – | – | – |
| Omze Export and Import IncSan Diego, CA, United States · USchecked 2 Nov 2026 | US | 0 | – | – | – | – | – |
| On Cloud Wine Za LtdThames Ditton, United Kingdom · UKchecked 2 Nov 2026 | UK | 0 | – | – | – | – | 2021 |
| On the Front Vines, LLCArdmore, PA, United States · USchecked 2 Nov 2026 | US | 0 | – | – | – | – | – |
| On Wheels Group LtdArdwick, United Kingdom · UKchecked 2 Nov 2026 | UK | 0 | – | – | – | – | 2024 |
| Onda Wine, LLCBerkeley, CA, United States · USchecked 2 Nov 2026 | US | 0 | – | – | – | – | – |
| One Genna Wholesale LLCOrlando, FL, United States · USchecked 2 Nov 2026 | US | 0 | – | – | – | – | – |
| One Green Barrel LtdLondon, United Kingdom · UKchecked 2 Nov 2026 | UK | 0 | – | – | – | – | 2021 |
| One More Wine Shop LtdNorthallerton, United Kingdom · UKchecked 2 Nov 2026 | UK | 0 | – | – | – | – | 2021 |
| One Stop Stores LimitedWalsall, United Kingdom · UKchecked 2 Nov 2026 | UK | 0 | – | – | – | – | 1990 |
| One To Wine LimitedLondon Colney, United Kingdom · UKchecked 2 Nov 2026 | UK | 0 | – | – | – | – | 2015 |
| One True Vine, LLCCA, United States · USchecked 2 Nov 2026 | US | 0 | – | – | – | – | – |
| One World Nutrients, Inc.Gardena, CA, United States · USchecked 2 Nov 2026 | US | 0 | – | – | – | – | – |
| Onze Importers, LLCOakland Park, FL, United States · USchecked 2 Nov 2026 | US | 0 | – | – | – | – | – |
| Ooberstock LimitedDartford, United Kingdom · UKchecked 2 Nov 2026 | UK | 0 | – | – | – | – | 2010 |
| Opatra LtdLondon, United Kingdom · UKchecked 2 Nov 2026 | UK | 0 | – | – | – | – | 2010 |
| Open House London LimitedLondon, United Kingdom · UKchecked 2 Nov 2026 | UK | 0 | – | – | – | – | 2013 |
| OpenWine s.r.o.Prostějov, Czechia · CZopenwine.cz · checked 24 Oct 2026 | CZ | 0 | 14 | Spain, Argentina, ChileCachapoal Valley, Costers del Segre | –Value (producers) | 7% | 2009 |
| Oppermann London LtdLondon, United Kingdom · UKchecked 2 Nov 2026 | UK | 0 | – | – | – | – | 2012 |