| British Albanian Chamber of Commerce Ltd | London | 2025 |
| British Allied Trades Federation | Birmingham | 1901 |
| British Amateur Gymnastics Association(The) | Newport | 1982 |
| British American Football Association | Manchester | 1987 |
| British and Irish Orthoptic Society | Birmingham | 1985 |
| British Antique Dealers' Association(The) | London | 1951 |
| British Argentine Chamber of Commerce | | 1995 |
| British Armenian Chamber of Commerce | London | 2026 |
| British Asians Welfare Association Ltd | Ilford Essex | 2017 |
| British Assistive Technology Association Limited | Melksham | 2010 |
| British Association for Behavioural and Cognitive Psychotherapies | Bury | 2003 |
| British Association for Cardiovascular Prevention and Rehabilitation | London | 2004 |
| British Association for Child and Adolescent Public Health | London | 2016 |
| British Association for Community Child Health | London | 2008 |
| British Association for Music Therapy | London | 2010 |
| British Association for Nutrition and Lifestyle Medicine | Eastbourne | 1997 |
| British Association for Psychoanalytic and Psychodynamic Supervision Limited | Dagenham | 2006 |
| British Association for Screen Entertainment Limited | Sutton | 1980 |
| British Association for Sport and Law Limited | Manchester | 2003 |
| British Association of Concert Halls | London | 2002 |
| British Association of Accountants and Auditors Limited(The) | Newcastle Upon Tyne | 1923 |
| British Association of Aesthetic & Medical Micro-Pigmentation | Evesham | 2015 |
| British Association of Aesthetic Plastic Surgeons | London | 1985 |
| British Association of Art Therapists Limited | Greater London | 1977 |
| British Association of Construction Heads Limited | Sheerness | 2024 |
| British Association of Dental Therapists Limited | Blackburn | 2015 |
| British Association of Medical Aesthetic Nurses | Southampton | 2013 |
| British Association of Mountain Guides | Conwy | 1996 |
| British Association of Occupational Therapists Limited | London | 1945 |
| British Association of Private Dentistry | London | 2020 |
| British Association of Reinforcement Limited | Bracknell | 2005 |
| British Association of Removers (Services) Limited | Watford | 1976 |
| British Association of Removers (Training Services) Limited | Watford | 1991 |
| British Association of Social Workers (the) | Birmingham | 1970 |
| British Association of Women Entrepreneurs | London | 1995 |
| British Athletics Supporters Club Limited | Stafford | 2010 |
| British Autonomic Society Limited | London | 2024 |
| British Balboa Limited | Milton Keynes | 2024 |
| British Bangladesh Business Council Limited | Greenford | 2015 |
| British Bangladesh Minicab Drivers Association Limited | London | 2013 |
| British Bangladeshi Accountants Association Ltd | Ilford | 2016 |
| British Bangladeshi Friends of Labour Limited | London | 2024 |
| British Bangladeshi Women’S Organisation Ltd | Romford | 2023 |
| British Beauty Council | London | 2018 |
| British Beer & PUB Association | London | 1974 |
| British Board of Film Classification | | 1911 |
| British Boer and Meat Goat Association | Bourne | 2022 |
| British Bosnian and Herzegovinian Chamber of Commerce | London | 2021 |
| British Camelids Limited | Milton Keynes | 1988 |
| British Canoeing | Nottingham | 1980 |
| British Cardiovascular Intervention Society | Leicester | 2010 |
| British Ceramic Confederation Ltd | Stoke-On-Trent | 2019 |
| British Chamber of Commerce Azerbaijan Ltd | London | 2021 |
| British Chamber of Commerce for Italy(Incorporated)(The) | Ipswich | 1914 |
| British Chamber of Commerce in Kazakhstan | Harrow | 2014 |
| British Chambers of Commerce | London | 1875 |
| British Chemicals Association | Bournemouth | 1983 |
| British Chiropractic Association | Wolverhampton | 1984 |
| British Christmas Tree Growers Association | Harrogate | 2020 |
| British Cleaning Council Ltd | Northampton | 1987 |
| British Co-Masonic Trust Limited | Surbiton | 1921 |
| British Coatings Federation Limited | Coventry | 1962 |
| British Compressed Air Society Limited | Newcastle Upon Tyne | 1998 |
| British Compressed Gases Association | Derby | 1901 |
| British Connemara Pony Society Limited | Alton | 1971 |
| British Copyright Council | London | 2007 |
| British Cosmetic Dermatology Group Ltd | Walsall | 2026 |
| British Council for Offices | London | 1990 |
| British Croatian Chamber of Commerce | London | 1998 |
| British Damage Management Association | Market Harborough | 1999 |
| British Deaf Association | London | 1993 |
| British Dental Association | London | 1880 |
| British Dietetic Association(The) | Birmingham | 1947 |
| British Drilling Association Limited | Brentwood | 1977 |
| British Ecological Society(The) | London | 1980 |
| British Educational Suppliers Association | London | 1973 |
| British Educational Travel Association Limited | London | 2002 |
| British EGG Industry Council | London | 1986 |
| British Equestrian Trade Association Limited(The) | Sicklinghall | 1978 |
| British Equestrian Vaulting Limited | Kenilworth | 1996 |
| British Fashion Council | London | 1986 |
| British Fashion Council Foundation | London | 2019 |
| British Fertility Society Limited | London | 1999 |
| British Film Designers Guild Limited | Bourne End | 1982 |
| British Fire Protection Systems Association Limited(The) | Hampton | 1966 |
| British Fire Services Association(The) | Sleaford | 1912 |
| British Footwear Association Limited | Northampton | 1898 |
| British Foundation for the University of the West Indies | London | 2007 |
| British Franchise Association | Reading | 1977 |
| British Free Range EGG Marketing Limited | Newcastle Upon Tyne | 2000 |
| British Free Range EGG Producers Association Limited | Newcastle Upon Tyne | 2023 |
| British Friends of Israel Limited | London | 2023 |
| British Friends of Saudi Arabia Ltd | London | 2026 |
| British Friends of the Hebrew University of Jerusalem | London | 2007 |
| British Frozen Food Federation | Newark | 2011 |
| British FUR Trade Association (Incorporated) | London | 1919 |
| British Furniture Association Ltd | Banbury | 1949 |
| British Furniture Confederation | Skipton | 2006 |
| British GAS Services Limited | Berkshire | 1995 |
| British Gear Association | Halifax | 1993 |