- Campbeltown Pupils AFC
- Chalfont St Peter AFC
- Charlton Rovers AFC
- Cheltenham & Cotswold Advanced Motorcyclists
- Cheltenham Cricket Club
- Cheltenham Cricket Club Ladies
- Cheltenham Netball Club
- Cheltenham Saracens
- Cheltenham Town Ladies FC
- Cheltenham Town Ladies Youth FC
- Chesterton AFC
- Chobham Academy
- Christ's College Finchley
- Churchdown Panthers FC
- Cotswold Gymnastics Club
- Cougars Basketball
- Court Farm AFC
- CPD Iau Bryn Rhosyr
- CPD Mynydd Llandegai
- CPD Mynydd Tigers
- Cranleigh FC
- David Lloyd Tennis
- Digitech Studio School
- Dover Rangers FC
- Drakes Broughton Rangers FC
- Drove Primary School
- Dunstable Town FC
- Dursley Town AFC
- Dursley Town Girls AFC
- Dursley Town Girls Coaches
