| International College of Higher Studies Ltd | London | 2026 |
| International College of Islamic Sciences London Ltd | Cardiff | 2025 |
| International College of London Ltd | London | 2021 |
| International College of Naturopathic Science Limited | London | 2021 |
| International College of Oriental Medicine (U.K.) Limited(The) | East Grinstead | 1977 |
| International College Portsmouth Ltd. | Abingdon | 2008 |
| International College, Manchester Limited | Manchester | 2010 |
| International Communities Organisation Limited | London | 2016 |
| International Community College Limited | | 1986 |
| International Community of Syrian Radiologists Ltd | Billingham | 2025 |
| International Community Schools Limited | London | 2016 |
| International Connect Ltd | London | 2017 |
| International Consortium of Management and Technology Professionals Ltd | London | 2023 |
| International Consulting Association | London, | 2007 |
| International Corporate Training Limited | Doncaster | 2015 |
| International Correspondence Schools Limited | Glasgow | 2012 |
| International Council for Education of People With Visual Impairment | London | 2002 |
| International Creativity Academy Limited | Cardiff | 2025 |
| International Dance Rhythms Limited | Barnet | 2021 |
| International Develop Learning Instruction Limited | Cardiff | 2021 |
| International Development Foundation (IDF) | London | 1997 |
| International Dragon Boat Federation Limited | Guildford | 2020 |
| International Driving School Ltd | Bristol | 2020 |
| International Dublin Education Ltd | London | 2022 |
| International Dyslexia Learning Solutions Limited | Lancaster | 2013 |
| International Eco LC Limited | Woking | 2023 |
| International Edge Ltd | London | 2024 |
| International Education & Culture Ltd | London | 2024 |
| International Education Academy Ltd | Birmingham | 2023 |
| International Education Agency Ltd | Crook | 2024 |
| International Education Board Ltd | London | 2021 |
| International Education Camp Ltd | Hull | 2020 |
| International Education Center, Oxford (UK) Ltd | Watlington | 2004 |
| International Education Connect Ltd | Huntingdon | 1989 |
| International Education Counselling Centre UK Ltd | Rochdale | 2025 |
| International Education Enterprise | Nottingham | 2011 |
| International Education Integration Ltd | London | 2017 |
| International Education Limited | London | 2025 |
| International Education Link UK Limited | London | 2025 |
| International Education Management Support Ltd | London | 2022 |
| International Education Network Limited | Chichester | 2024 |
| International Education Online Ltd | London | 2018 |
| International Education Organisation Limited | London | 2022 |
| International Education Partners Ltd | Hayes | 2017 |
| International Education Service Arab World Ltd | Newcastle Upon Tyne | 2004 |
| International Education Services Ltd | Bradford | 2022 |
| International Education Society Ltd | London | 2004 |
| International Education Solutions Ltd | Gillingham | 2017 |
| International Education Solutions Products Ltd | Gillingham | 2018 |
| International Education Systems Limited | Bristol | 1991 |
| International Educational Development Limited | Bradford | 2019 |
| International Elite Education Consultancy Ltd | York | 2018 |
| International Elite Ltd | Enfield | 2017 |
| International English Language Testing UK Ltd | London | 2026 |
| International Enrichment Ltd | London | 2017 |
| International Entrepreneurs Association | Altrincham | 2004 |
| International Executive Function Coaching Certification CIC | Ipswich | 2025 |
| International Fast 3’S Ltd | Glasgow | 2025 |
| International Federation for Coaching and Facilitation Ltd | Sevenoaks | 2022 |
| International Federation of Computational Logic Limited | | 2004 |
| International Federation of Surgical Colleges and Societies (Ifscs) Ltd | London | 2011 |
| International Feng Shui Academy Limited | Chichester | 2025 |
| International Fire Safety Management Center Limited | Manchester | 2024 |
| International Fitness Alliance Limited | Newcastle Upon Tyne | 2015 |
| International Flight Training Academy Ltd | Harrow | 2025 |
| International Foodlympic Foundation | Edinburgh | 2025 |
| International Football Academies Ltd | Calstock | 2025 |
| International Forum of Development Organizations (Ifdo) Ltd | London | 2024 |
| International Forums of Inclusion Practitioners Ltd | London | 2021 |
| International Franchise Office Limited | Manchester | 2020 |
| International Friends of the National Gallery of Ireland Limited | Hertford | 1996 |
| International Functional Consultants Ltd | London | 2019 |
| International Futsal Academy Ltd | Mountsorrel | 2012 |
| International Futures Forum | Aberdour | 2007 |
| International Governance and Risk Limited | London | 2010 |
| International Greenkeepers for Hire Ltd | Swindon | 2022 |
| International Gro-Do Federation | Hull | 2020 |
| International Higher Study Support Centre Ltd | London | 2026 |
| International Hospitality & Management School UK Ltd | Ilford | 2019 |
| International House Belfast Limited | Belfast | 2006 |
| International House Bristol Ltd | Bristol | 2003 |
| International House Newcastle Teacher Training Limited | Newcastle Upon Tyne | 1997 |
| International House Trust Limited | London | 1976 |
| International House World Organisation Limited | London | 2002 |
| International Humanitarian College of London Limited | London | 2025 |
| International Icon of Professional Education Ltd | Coventry | 2026 |
| International IMS Limited | Northwood | 2025 |
| International Inclusion Quality Mark Limited | Basingstoke | 2012 |
| International Independent Qualifications Ltd | London | 2014 |
| International Industrial Qualifications Ltd | London | 2023 |
| International Information Systems Security Certification Consortium Limited | London | 2002 |
| International Insights for Entrepreneurship Ltd | Nottingham | 2019 |
| International Institute of Risk and Safety Management | London | 2004 |
| International Islamic College UK Limited | Leicester | 2025 |
| International Islamic University (Islamabad) London Campus Limited | London | 2009 |
| International Islamic Youth League Iiyl Ltd | London | 2025 |
| International Japan Karate Association - United Kingdom | Crowle | 2021 |
| International Jatt Forum | Saffron Walden | 2003 |
| International Journal of Advances in Soft Computing and ITS Applications Ltd | London | 2025 |
| International Journal of Private HE Limited | Luton | 2021 |