| Commonwealth Lawyers Association Limited | Bristol | 2009 |
| Commonwealth Local Government Forum | London | 1994 |
| Commonwealth Organisation for Social Work | Northampton | 2005 |
| Commonwealth Parliamentary Association (United Kingdom Branch) | London | 2002 |
| Commonwealth Partnership for Technology Management Limited | London | 1995 |
| Commonwealth Research Group Ltd | Bicester | 2024 |
| Commonwealth Social Housing Company Ltd | South Croydon | 2023 |
| Commonwealth Youth Council Limited | London | 2013 |
| Commplex Group Ltd | Stockton-On-Tees | 2021 |
| Commplex Network Services Ltd | Stockton-On-Tees | 2017 |
| Comms & Controls Ltd | Todmorden | 2024 |
| Comms Council UK Limited | London | 2005 |
| Commstar Space Communications Ltd | London | 2020 |
| Commsult Limited | Bromley | 2007 |
| Commtech Global Limited | Liverpool | 2018 |
| Communal Clean IT Right Limited | London | 2010 |
| Communal Facilities Management Limited | Walsall | 2009 |
| Commune Investments Limited | Mirfield | 2020 |
| Communicate Clearly Speech Therapy Ltd | Blackpool | 2021 |
| Communicate Innovate Ltd | Stockport | 2024 |
| COMMUNICATE2U Ltd | Rugeley | 2011 |
| Communication That Connects Group Limited | London | 2012 |
| Communichild CIC | Waltham Abbey | 2023 |
| Communicloud Limited | Blackpool | 2017 |
| Communikate Limited | Slough | 2017 |
| Communities 1ST | St Albans | 2019 |
| Communities Against Factory Farming Limited | Lower Clapton, London | 2026 |
| Communities Church Ltd | Shildon | 2025 |
| Communities That Work Ltd | Nottingham | 2015 |
| Communities Welfare Network | London | 2004 |
| Communitology Limited | Woking | 2025 |
| Community & Voluntary Support Conwy | Colwyn Bay | 1999 |
| Community Achievement Network Limited | London | 2009 |
| Community Action Bradford & District Ltd. | Bingley | 2001 |
| Community Action Derby Ltd | Derby | 1994 |
| Community Action East Sussex | Polegate | 2003 |
| Community Action Foundation Africa (Cafa) | London | 2025 |
| Community Action Hampshire | Winchester | 1996 |
| Community Action Northumberland | Morpeth | 2011 |
| Community Action Wyre Forest | Halesowen | 2000 |
| Community Action: MK | Milton Keynes | 2001 |
| Community Advice Ards and North Down Ltd | Bangor | 1998 |
| Community Advice Causeway | Coleraine | 1998 |
| Community Advice Fermanagh Ltd | Enniskillen | 2010 |
| Community Advice Lisburn & Castlereagh | Lisburn | 2006 |
| Community Advice Newry, Mourne & Down | Newry | 2015 |
| Community Agribusiness Partners | Aylesford | 2023 |
| Community Aids One Stop Centre CIC | London | 2025 |
| Community Alliance Trading Enterprises Limited | Edinburgh | 2013 |
| Community and Voluntary Services Cheshire East | Crewe | 2009 |
| Community Assemblies Project (UK) Ltd | London | 2025 |
| Community Assets Services Cooperative Limited | Manchester | 2019 |
| Community Barnet | London | 1998 |
| Community Beauty Limited | Brighton | 2024 |
| Community Bees CIC | York | 2019 |
| Community Bilingual Services Ltd | Peterborough | 2013 |
| Community Buses Bradford CIC | Bradford | 2024 |
| Community Calm CIC | Slough | 2024 |
| Community Cancer Cafes CIC | St. Austell | 2024 |
| Community Care Foundation Birmingham Ltd | Birmingham | 2020 |
| Community Careline N W L Limited | Coalville | 2008 |
| Community Catalysts C.I.C. | Harrogate | 2009 |
| Community Centre Pueblito Paisa CIC | London | 2017 |
| Community Challenge Events Limited | Harpenden | 2025 |
| Community Champions Ltd | Bourne | 2018 |
| Community Church Edinburgh | Edinburgh | 2012 |
| Community Church Harlesden | London | 2007 |
| Community Church, Putney | London | 2014 |
| Community Connect Network CIC | Birmingham | 2025 |
| Community Consulting Ltd | London | 2024 |
| Community Crafting CIC | Stockport | 2023 |
| Community Crematoria Limited | Bristol | 2011 |
| Community Development 4 ALL CIC | London | 2021 |
| Community Development Company of Nesting | Shetland | 2018 |
| Community Development Finance Association | London | 2000 |
| Community Development Lens | Isle Of North Uist | 2018 |
| Community Elderly and Disabled Support CIC | Manchester | 2024 |
| Community Energy Association (England) Limited | Sheffield | 2014 |
| Community Energy in Pembrokeshire Community Interest Company | Narberth | 2011 |
| Community Energy Management Co. Ltd | Barrow-In-Furness | 1994 |
| Community Energy Scotland Limited | Inverness | 2007 |
| Community Energy Wales - Ynni Cymunedol Cymru | Cardiff | 2012 |
| Community Enterprise East London | Barking | 2008 |
| Community Family Services Ltd | Liverpool | 2013 |
| Community Fitness Network Limited | Grimsby | 2019 |
| Community Footprints Limited | Walsall | 2015 |
| Community Footprints Service C.I.C. | Walsall | 2012 |
| Community Fortune Ltd | London | 2025 |
| Community Foundation for Wakefield | Wakefield | 2007 |
| Community Garden Support Ltd | Belfast | 2025 |
| Community GAS Partners Limited | Bideford | 2025 |
| Community Group & K Limited | Birmingham | 2019 |
| Community Hatch Limited | Southampton | 2023 |
| Community Health Services Limited | London | 1987 |
| Community Heart (London) | London | 2005 |
| Community Help and Neighbourly Care for Everyone | Tyne & Wear | 1998 |
| Community Help Offering Meals and Provisions (C.H.O.M.P.) C.I.C. | Lincoln | 2025 |
| Community Housing Cymru | Cardiff | 1989 |
| Community Hub Ipswich CIC | Ipswich | 2020 |
| Community Impact Partnership CIC | Sheffield | 2018 |