Head to Head
| Prem Rugby | 2015/12/05 15:00 | Harlequins v London Irish | W | 38-7 |
| Prem Rugby | 2015/03/07 15:00 | Harlequins v London Irish | W | 26-20 |
| Prem Rugby | 2014/09/06 15:30 | London Irish v Harlequins | W | 15-20 |
Home History
| Prem Rugby | 2016/01/31 15:00 | Newcastle Red Bulls v Harlequins | L | 26-19 |
| European Rugby Challenge Cup | 2016/01/22 19:45 | Montpellier v Harlequins | L | 42-9 |
| European Rugby Challenge Cup | 2016/01/17 15:15 | Harlequins v Cardiff Blues | W | 34-26 |
| Prem Rugby | 2016/01/09 15:00 | Harlequins v Saracens | W | 29-23 |
| Premiership Rugby Shield | 2016/01/04 19:30 | Exeter Braves v Harlequins | L | 18-3 |
| Prem Rugby | 2016/01/03 15:00 | Worcester Warriors v Harlequins | W | 20-24 |
| Premiership Rugby Shield | 2015/12/28 15:00 | Harlequins v London Irish A | W | 34-7 |
| Prem Rugby | 2015/12/27 16:30 | Harlequins v Gloucester | D | 39-39 |
Away History
| Prem Rugby | 2016/01/30 14:30 | Sale Sharks v London Irish | L | 38-10 |
| European Rugby Challenge Cup | 2016/01/23 19:45 | Agen v London Irish | W | 17-31 |
| European Rugby Challenge Cup | 2016/01/16 15:00 | London Irish v Grenoble | L | 18-28 |
| Prem Rugby | 2016/01/10 13:00 | London Irish v Newcastle Red Bulls | W | 20-15 |
| Prem Rugby | 2016/01/02 15:00 | Gloucester v London Irish | L | 27-14 |
| Prem Rugby | 2015/12/26 14:30 | London Irish v Northampton | W | 25-23 |
| European Rugby Challenge Cup | 2015/12/18 19:30 | Edinburgh v London Irish | L | 18-15 |
| European Rugby Challenge Cup | 2015/12/12 15:00 | London Irish v Edinburgh | W | 38-6 |