| SL4593 | NORTON J G | Chapeltown Community Centre | 01/01/2007 | 01/01/2007 | indefinite |
| SL6596 | NUNN Beverley | Pitsmoor Adventure Playground | 06/06/2024 | 06/06/2024 | indefinite |
| SL5807 | O'BRIEN J | Busk Meadow Nursery & Infant School | 01/01/2007 | 01/01/2007 | indefinite |
| SL4599 | ORMOND Graham | Abbey Lane Junior F C | 24/09/2024 | 01/01/2011 | indefinite |
| SL6635 | ORRILL Victoria | Bradfield Dungworth Parents and Friends Association | 19/11/2025 | 19/11/2025 | indefinite |
| SL6271 | OSBALDISTON Jane | South Sheffield Citizens Advice Bureau | 13/03/2012 | 07/07/2011 | indefinite |
| SL5946 | OSBORN Stephen | Inyerface Theatre Company | 04/01/2007 | 01/01/2007 | indefinite |
| SL6309 | OTLEY Vicky | Sheffield Junior Ice Hockey Academy | 02/02/2012 | 02/02/2012 | indefinite |
| SL5914 | OWEN David Lloyd | Sheffield Retired Greyhounds | 30/11/2009 | 01/01/2010 | indefinite |
| SL6250 | OWEN Graham | The Rotary Club of Hallam | 08/05/2012 | 08/05/2011 | indefinite |