- Gamblers Anonymous/Reading Group
- Get Berkshire Active
- Get Online Reading
- Girlguiding Reading Abbey Division
- Girlguiding Whiteknights District
- Give&TakeCare
- Gloucester Road Playgroup
- Gloucestershire Disabled Afloat Riverboats Trust
- GOB Radio
- Golden Opportunity Links for Development (GOLD)
- Grace Church
- Grace Church Caversham
- Graft (Thames Valley) Ltd
- Grange Memory Cafe
- Grazeley School PTA
- Greater Reading Environmental Network
- Greater Reading Nepalese Community Association
- Green Economics Institute Trust
- Green Health Thames Valley
- Greenham Control Tower Ltd
- Grenada Association (Reading)
- Greyfriars Church and Centre
- Greys Court
- GroceryAid
- Groundwork South
- Groundwork Thames Valley
- Guide Dogs for the Blind Association
