- Association of Chief Executives of Voluntary Organisations (ACEVO)
- ACRE
- BASSAC
- British Youth Council
- BTCV
- CEMVO
- Charities Evaluation Services
- Charity Trustee Networks (CTN)
- Church Urban Fund
- Citizenship Foundation
- Community Action Network
- Community Development Exchange
- Community Foundation Network
- Community Matters
- Community Service Volunteers (CSV)
- Consortium of LGB&T VCOs
- Co–operatives UK
- Development Trusts Association (DTA)
- Foyer Federation
- Institute of Fundraising
- Mentoring & Befriending Foundation
- National Council for Voluntary Youth Services (NCVYS)
- National Youth Agency
- NAVCA
- NCVO
- Philanthropy UK - Hosted by the Association of Charitable Foundations
- Prowess
- School for Social Entrepreneurs
- Social Enterprise Coalition
- Social Enterprise London CIC
- Social Firms
- The Plunkett Foundation
- Third Sector European Network
- TimeBank
- Urban Forum
- V
- Voice 4 Change England
- Volunteering England
- Women's Resource Centre
- Youth Action Network
- YouthNet UK
Office of the Third Sector
2nd Floor, Admiralty Arch
South Side, The Mall
London
SW1A 2WH
South Side, The Mall
London
SW1A 2WH