| 01 Sep 12 | r01        | ConnachtConnacht | 9 - 13 | Cardiff BluesCardiff Blues |
| 01 Sep 12 | r01        | ScarletsScarlets | 45 - 20 | LeinsterLeinster |
| 01 Sep 12 | r01        | EdinburghEdinburgh | 18 - 23 | MunsterMunster |
| |
| 07 Sep 12 | r02        | ZebreZebre | 17 - 30 | ConnachtConnacht |
| 07 Sep 12 | r02        | Cardiff BluesCardiff Blues | 19 - 21 | EdinburghEdinburgh |
| 07 Sep 12 | r02        | GlasgowGlasgow | 13 - 18 | ScarletsScarlets |
| 07 Sep 12 | r02        | MunsterMunster | 19 - 6 | BenettonBenetton |
| 08 Sep 12 | r02        | LeinsterLeinster | 45 - 25 | DragonsDragons |
| 08 Sep 12 | r02        | OspreysOspreys | 13 - 16 | UlsterUlster |
| |
| 14 Sep 12 | r03        | OspreysOspreys | 10 - 28 | GlasgowGlasgow |
| 14 Sep 12 | r03        | UlsterUlster | 20 - 19 | MunsterMunster |
| 14 Sep 12 | r03        | EdinburghEdinburgh | 41 - 10 | ZebreZebre |
| 15 Sep 12 | r03        | ConnachtConnacht | 11 - 24 | ScarletsScarlets |
| 15 Sep 12 | r03        | BenettonBenetton | 18 - 19 | LeinsterLeinster |
| 15 Sep 12 | r03        | DragonsDragons | 5 - 16 | Cardiff BluesCardiff Blues |
| |
| 21 Sep 12 | r04        | ScarletsScarlets | 16 - 23 | OspreysOspreys |
| 21 Sep 12 | r04        | GlasgowGlasgow | 27 - 17 | ConnachtConnacht |
| 22 Sep 12 | r04        | LeinsterLeinster | 22 - 16 | EdinburghEdinburgh |
| 22 Sep 12 | r04        | Cardiff BluesCardiff Blues | 34 - 18 | BenettonBenetton |
| 22 Sep 12 | r04        | MunsterMunster | 33 - 13 | DragonsDragons |
| |
| 28 Sep 12 | r05        | DragonsDragons | 32 - 12 | EdinburghEdinburgh |
| 28 Sep 12 | r05        | Cardiff BluesCardiff Blues | 19 - 48 | UlsterUlster |
| 28 Sep 12 | r05        | GlasgowGlasgow | 22 - 19 | ZebreZebre |
| 28 Sep 12 | r05        | ConnachtConnacht | 34 - 6 | LeinsterLeinster |
| 29 Sep 12 | r05        | BenettonBenetton | 22 - 20 | ScarletsScarlets |
| 29 Sep 12 | r05        | OspreysOspreys | 30 - 15 | MunsterMunster |
| |
| 05 Oct 12 | r06        | ZebreZebre | 16 - 34 | OspreysOspreys |
| 05 Oct 12 | r06        | ScarletsScarlets | 24 - 13 | DragonsDragons |
| 05 Oct 12 | r06        | UlsterUlster | 25 - 0 | ConnachtConnacht |
| 05 Oct 12 | r06        | EdinburghEdinburgh | 22 - 27 | BenettonBenetton |
| 06 Oct 12 | r06        | Cardiff BluesCardiff Blues | 3 - 18 | GlasgowGlasgow |
| 06 Oct 12 | r06        | LeinsterLeinster | 30 - 21 | MunsterMunster |
| |
| 26 Oct 12 | r07        | DragonsDragons | 19 - 46 | UlsterUlster |
| 26 Oct 12 | r07        | EdinburghEdinburgh | 28 - 29 | ScarletsScarlets |
| 26 Oct 12 | r07        | MunsterMunster | 29 - 3 | ZebreZebre |
| 27 Oct 12 | r07        | OspreysOspreys | 26 - 9 | ConnachtConnacht |
| 27 Oct 12 | r07        | BenettonBenetton | 13 - 24 | GlasgowGlasgow |
| 27 Oct 12 | r07        | LeinsterLeinster | 59 - 22 | Cardiff BluesCardiff Blues |
| |
| 02 Nov 12 | r08        | Cardiff BluesCardiff Blues | 18 - 24 | MunsterMunster |
| 02 Nov 12 | r08        | UlsterUlster | 45 - 20 | EdinburghEdinburgh |
| 02 Nov 12 | r08        | GlasgowGlasgow | 37 - 6 | DragonsDragons |
| 03 Nov 12 | r08        | ConnachtConnacht | 18 - 3 | BenettonBenetton |
| 03 Nov 12 | r08        | ScarletsScarlets | 22 - 13 | ZebreZebre |
| 04 Nov 12 | r08        | OspreysOspreys | 19 - 10 | LeinsterLeinster |
| |
| 18 Nov 12 | r04        | ZebreZebre | 25 - 27 | UlsterUlster |
| |
| 23 Nov 12 | r09        | BenettonBenetton | 15 - 16 | UlsterUlster |
| 23 Nov 12 | r09        | DragonsDragons | 14 - 3 | ConnachtConnacht |
| 23 Nov 12 | r09        | EdinburghEdinburgh | 23 - 13 | OspreysOspreys |
| 23 Nov 12 | r09        | GlasgowGlasgow | 0 - 6 | LeinsterLeinster |
| 25 Nov 12 | r09        | ZebreZebre | 7 - 14 | Cardiff BluesCardiff Blues |
| 25 Nov 12 | r09        | MunsterMunster | 6 - 13 | ScarletsScarlets |
| |
| 30 Nov 12 | r10        | OspreysOspreys | 33 - 12 | Cardiff BluesCardiff Blues |
| 01 Dec 12 | r10        | BenettonBenetton | 32 - 13 | DragonsDragons |
| 01 Dec 12 | r10        | ConnachtConnacht | 23 - 24 | EdinburghEdinburgh |
| 01 Dec 12 | r10        | LeinsterLeinster | 37 - 7 | ZebreZebre |
| 01 Dec 12 | r10        | MunsterMunster | 31 - 3 | GlasgowGlasgow |
| 02 Dec 12 | r10        | ScarletsScarlets | 12 - 19 | UlsterUlster |
| |
| 21 Dec 12 | r11        | Cardiff BluesCardiff Blues | 6 - 9 | ScarletsScarlets |
| 21 Dec 12 | r11        | UlsterUlster | 27 - 19 | LeinsterLeinster |
| 21 Dec 12 | r11        | GlasgowGlasgow | 23 - 14 | EdinburghEdinburgh |
| 22 Dec 12 | r11        | ZebreZebre | 3 - 10 | BenettonBenetton |
| 22 Dec 12 | r11        | ConnachtConnacht | 12 - 16 | MunsterMunster |
| |
| 26 Dec 12 | r12        | Cardiff BluesCardiff Blues | 12 - 10 | DragonsDragons |
| 26 Dec 12 | r12        | OspreysOspreys | 32 - 3 | ScarletsScarlets |
| 29 Dec 12 | r12        | BenettonBenetton | 26 - 18 | ZebreZebre |
| 29 Dec 12 | r12        | EdinburghEdinburgh | 17 - 21 | GlasgowGlasgow |
| 29 Dec 12 | r12        | MunsterMunster | 24 - 10 | UlsterUlster |
| 29 Dec 12 | r12        | LeinsterLeinster | 17 - 0 | ConnachtConnacht |
| |
| 31 Dec 12 | r11        | DragonsDragons | 3 - 14 | OspreysOspreys |
| |
| 04 Jan 13 | r13        | OspreysOspreys | 16 - 15 | ZebreZebre |
| 04 Jan 13 | r13        | UlsterUlster | 47 - 15 | ScarletsScarlets |
| 04 Jan 13 | r13        | GlasgowGlasgow | 41 - 7 | BenettonBenetton |
| 04 Jan 13 | r13        | EdinburghEdinburgh | 16 - 31 | LeinsterLeinster |
| 05 Jan 13 | r13        | ConnachtConnacht | 30 - 11 | DragonsDragons |
| 05 Jan 13 | r13        | MunsterMunster | 6 - 17 | Cardiff BluesCardiff Blues |
| |
| 08 Feb 13 | r14        | UlsterUlster | 12 - 16 | OspreysOspreys |
| 08 Feb 13 | r14        | Cardiff BluesCardiff Blues | 11 - 26 | LeinsterLeinster |
| 08 Feb 13 | r14        | DragonsDragons | 23 - 14 | BenettonBenetton |
| 08 Feb 13 | r14        | ScarletsScarlets | 25 - 15 | ConnachtConnacht |
| 09 Feb 13 | r14        | MunsterMunster | 30 - 3 | EdinburghEdinburgh |
| 10 Feb 13 | r14        | ZebreZebre | 20 - 36 | GlasgowGlasgow |
| |
| 15 Feb 13 | r15        | DragonsDragons | 3 - 60 | GlasgowGlasgow |
| 15 Feb 13 | r15        | UlsterUlster | 26 - 3 | ZebreZebre |
| 15 Feb 13 | r15        | EdinburghEdinburgh | 16 - 17 | Cardiff BluesCardiff Blues |
| 15 Feb 13 | r15        | ConnachtConnacht | 22 - 10 | OspreysOspreys |
| 16 Feb 13 | r15        | LeinsterLeinster | 40 - 5 | BenettonBenetton |
| 16 Feb 13 | r15        | ScarletsScarlets | 18 - 10 | MunsterMunster |
| |
| 22 Feb 13 | r16        | Cardiff BluesCardiff Blues | 22 - 26 | ConnachtConnacht |
| 22 Feb 13 | r16        | GlasgowGlasgow | 20 - 14 | UlsterUlster |
| 22 Feb 13 | r16        | OspreysOspreys | 24 - 7 | EdinburghEdinburgh |
| 23 Feb 13 | r16        | LeinsterLeinster | 32 - 5 | ScarletsScarlets |
| 24 Feb 13 | r16        | BenettonBenetton | 34 - 10 | MunsterMunster |
| 24 Feb 13 | r16        | ZebreZebre | 13 - 14 | DragonsDragons |
| |
| 01 Mar 13 | r17        | DragonsDragons | 19 - 26 | LeinsterLeinster |
| 01 Mar 13 | r17        | ScarletsScarlets | 14 - 13 | EdinburghEdinburgh |
| 01 Mar 13 | r17        | UlsterUlster | 29 - 29 | BenettonBenetton |
| 01 Mar 13 | r17        | GlasgowGlasgow | 29 - 13 | Cardiff BluesCardiff Blues |
| 01 Mar 13 | r17        | ConnachtConnacht | 23 - 19 | ZebreZebre |
| 02 Mar 13 | r17        | MunsterMunster | 13 - 13 | OspreysOspreys |
| |
| 22 Mar 13 | r18        | ZebreZebre | 10 - 24 | ScarletsScarlets |