| SL6613 | CLASON Debra | Utilita Energy Hub | 01/04/2025 | 24/11/2005 | indefinite |
| SL6239 | CLARSON David | Burton Street Project | 02/11/2010 | 23/12/2010 | indefinite |
| SL5685 | CLARKE Jane Ferguson | High Greave | 15/12/2010 | 01/01/2011 | indefinite |
| SL5952 | CLARKE Alison | Sheffield Folk Festival | 01/01/2007 | 01/01/2007 | indefinite |
| SL6535 | CLARK Elise | Sheffield Steelers Supporters Club | 05/10/2021 | 05/10/2021 | indefinite |
| SL6568 | CLARK Elise | Robert Dowd Testimonial | 17/03/2023 | 17/03/2023 | indefinite |
| SL5408 | CHILD John | Parish of St Peter Parochial Church Council | 12/11/2013 | 01/01/2014 | indefinite |
| SL6567 | CHEN Kerre | INDEPENDENT SHEFFIELD | 17/03/2023 | 17/03/2023 | indefinite |
| SL4355 | CHEETHAM Z | St Thomas of Canterbury School | 06/12/2007 | 01/01/2009 | indefinite |
| SL5838 | CHARLES Steve | Millhouses Juniors FC | 03/12/2007 | 01/01/2008 | indefinite |