| SL0116 | KIMPTON Ian | Sleaford & District Indoor Bowls Club | 23/10/2024 | 01/01/2008 | indefinite |
| SL0407 | KING Stacey | Friends of St Michael's School | 24/04/2025 | 03/06/2024 | indefinite |
| SL0318 | KIRK Alwyn N | Ruskington Village Hall | 21/08/2024 | 15/10/2018 | indefinite |
| SL0328 | KNOWLES Stacey | Bracebridge Heath Parish Council | 05/02/2025 | 10/12/2019 | indefinite |
| SL0264 | LANGRIDGE Corinna | Leasingham St Andrews Church | 09/06/2025 | 18/04/2013 | indefinite |
| SL0084 | LAZENBY B | Royal British Legion - Washingborough Branch | 08/12/2023 | 01/01/2008 | indefinite |
| SL0115 | LEACH J | New Friends of the Holt | 27/10/2025 | 01/01/2008 | indefinite |
| SL0371 | LEGGITT Beverley Jane | Lineside Finale & Working Weekend | 24/02/2025 | 14/04/2022 | indefinite |
| SL0028 | LINGARD David | LIPU-UK | 13/05/2025 | 13/08/2008 | indefinite |
| SL0396 | LOUISE Sarah | Witham St Hughs Academy PTFA | 21/10/2025 | 20/12/2023 | indefinite |