- Ichthyosis Support Group (ISG)
- Imaad
- Imani Mission Congregation (Swahili)
- Independent Age
- Independent Monitoring Board
- INDI South East
- Indian Community Association
- INSAAN (The Integrated Network for Special And Additional Needs)
- Inside Out
- Integrated Research and Development Centre (IRDC)
- Intelligent Health
- Intercessor’s Church
- involve (formerly Bracknell Forest Voluntary Action)
- involve – Wokingham Borough (formerly Voluntary Action Wokingham Borough)
