Head to Head
| Premiership Rugby Shield | 2015/12/28 15:00 | Harlequins v London Irish A | L | 34-7 |
| Premiership Rugby Shield | 2014/12/15 19:30 | London Irish A v Harlequins | L | 7-12 |
Home History
| Premiership Rugby Shield | 2017/09/04 16:30 | London Irish A v Gloucester United | L | 19-38 |
| Premiership Rugby Shield | 2016/04/11 18:30 | London Irish A v Bath United | L | 0-17 |
| Premiership Rugby Shield | 2016/03/28 18:00 | London Irish A v Exeter Braves | L | 0-36 |
| Premiership Rugby Shield | 2015/12/28 15:00 | Harlequins v London Irish A | L | 34-7 |
| Premiership Rugby Shield | 2015/12/21 19:30 | London Irish A v L. Wasps | L | 7-36 |
| Premiership Rugby Shield | 2015/11/30 19:30 | Saracens Storm v London Irish A | L | 36-5 |
| Premiership Rugby Shield | 2015/11/23 19:15 | Bristol United v London Irish A | L | 24-14 |
| Premiership Rugby Shield | 2014/12/22 19:30 | Bath United v London Irish A | L | 44-5 |
Away History
| Premiership Rugby | 2017/09/09 14:00 | Harlequins v Gloucester | W | 28-17 |
| Premiership Rugby Shield | 2017/09/04 16:30 | Harlequins v Exeter Braves | L | 9-20 |
| Premiership Rugby | 2017/09/02 15:45 | London Irish v Harlequins | L | 39-29 |
| Amistosos | 2017/08/19 13:00 | Harlequins v Jersey | W | 47-21 |
| Premiership Rugby | 2017/05/06 15:00 | Northampton v Harlequins | L | 22-20 |
| Premiership Rugby | 2017/04/28 18:45 | Harlequins v Wasps | W | 32-13 |
| Premiership Rugby | 2017/04/14 18:45 | Harlequins v Exeter Chiefs | L | 26-39 |
| Premiership Rugby Shield | 2017/04/10 18:30 | Bath United v Harlequins | L | 34-7 |