| Harrow A | Division Three | 2024/25 Season|Thames Valley Chess League | No |
| Harrow KO A | Knockout Cup | 2024/25 Season|Thames Valley Chess League | No |
| Harrow Juniors 1 | Division 2 | 2024/25 season|Middlesex League | No |
| Harrow 1 | Division 1 | 2024/25 season|Middlesex League | No |
| Harrow Juniors 2 | Division 3 | 2024/25 season|Middlesex League | No |
| Harrow B | Hillingdon Div 1 | 2024-25|Hillingdon & District League | No |
| Harrow A | Hillingdon Div 1 | 2024-25|Hillingdon & District League | No |
| Harrow C | Hillingdon Div 2 | 2024-25|Hillingdon & District League | No |
| Harrow JA | Hillingdon Div 2 | 2024-25|Hillingdon & District League | No |
| Harrow JB | Hillingdon Div 2 | 2024-25|Hillingdon & District League | No |
| Harrow F | Hillingdon Div 3 | 2024-25|Hillingdon & District League | No |
| Harrow JC | Hillingdon Div 3 | 2024-25|Hillingdon & District League | No |
| Harrow D | Hillingdon Div 3 | 2024-25|Hillingdon & District League | No |
| Harrow E | Hillingdon Div 3 | 2024-25|Hillingdon & District League | No |
| Harrow XJA | Hillingdon Div X | 2024-25|Hillingdon & District League | No |
| Harrow XJB | Hillingdon Div X | 2024-25|Hillingdon & District League | No |
| Harrow Jnr | Cup KO | 2024-25|Hillingdon & District League | No |
| Harrow | Cup KO | 2024-25|Hillingdon & District League | No |
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