| Aviva Premiership Fixtures & Results |
|
| Date | Time | Comp | Home |
| Away | Venue |
|
| September 2012 |
| Sat 1 Sep | 2:00 | PR | London Wasps | 40 - 42 | Harlequins | Twickenham | Report |
| Fri 7 Sep | 7:45 | PR | Harlequins | 40 - 3 | London Welsh | Twickenham Stoop | Report |
| Sat 15 Sep | 3:00 | PR | Harlequins | 37 - 14 | Sale Sharks | Twickenham Stoop | More |
| Sat 22 Sep | 5:30 | PR | Leicester Tigers | 9 - 22 | Harlequins | Welford Road | Report |
| Sun 30 Sep | 2:00 | PR | Harlequins | 16 - 18 | Saracens | Twickenham Stoop | Report |
| October 2012 |
| Sat 6 Oct | 3:00 | PR | Exeter Chiefs | 42 - 28 | Harlequins | Sandy Park | Report |
| Sun 28 Oct | 2:15 | PR | London Irish | 28 - 31 | Harlequins | Madejski Stadium | Report |
| November 2012 |
| Sat 3 Nov | 5:15 | PR | Harlequins | 28 - 25 | Gloucester Rugby | Twickenham Stoop | Report |
| Fri 23 Nov | 7:45 | PR | Bath Rugby | 21 - 18 | Harlequins | Recreation Ground | Report |
| Fri 30 Nov | 7:45 | PR | Harlequins | 22 - 19 | Worcester Warriors | Twickenham Stoop | Report |
| December 2012 |
| Sat 22 Dec | 3:15 | PR | Northampton Saints | 9 - 18 | Harlequins | Franklin's Gardens | More |
| Sat 29 Dec | 2:15 | PR | Harlequins | 26 - 15 | London Irish | Twickenham | Report |
| January 2013 |
| Sun 6 Jan | 3:00 | PR | London Welsh | 26 - 31 | Harlequins | Kassam Stadium | Report |
| February 2013 |
| Sat 9 Feb | 8:00 | PR | Harlequins | 16 - 17 | London Wasps | Twickenham Stoop | Report |
| Sat 16 Feb | 5:15 | PR | Harlequins | 25 - 21 | Leicester Tigers | Twickenham Stoop | Preview |
| Fri 22 Feb | 8:00 | PR | Sale Sharks | 21 - 30 | Harlequins | Salford City Stadium | Report |
| March 2013 |
| Sat 2 Mar | 3:15 | PR | Harlequins | 16 - 27 | Exeter Chiefs | Twickenham Stoop | Report |
| Sun 24 Mar | 2:00 | PR | Saracens | 27 - 12 | Harlequins | Allianz Park | More |
| Fri 29 Mar | 7:45 | PR | Gloucester Rugby | 17 - 15 | Harlequins | Kingsholm | Report |
| April 2013 |
| Sat 13 Apr | 2:15 | PR | Harlequins | 23 - 9 | Bath Rugby | Twickenham Stoop | Report |
| Sat 20 Apr | 3:00 | PR | Worcester Warriors | 26 - 42 | Harlequins | Sixways | Report |
| May 2013 |
| Sat 4 May | 2:30 | PR | Harlequins | 22 - 19 | Northampton Saints | Twickenham Stoop | Report |
| Sat 11 May | 3:00 | PR-SF | Leicester Tigers | 33 - 16 | Harlequins | Welford Road | Report |
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