| Competition | Date | Game | Venue | KO (Irish time) |
| Preseason friendly | Fri Sept 2 | Harlequins 21-26 Leinster | The Stoop | 7:00 p.m. |
| UNITED RUGBY C’SHIP | Sat Sept 17 | Zebre Parma 29-33 Leinster | Stadio Sergio Lanfranchi | 1:00 p.m. |
| UNITED RUGBY C’SHIP | Fri Sept 23 | Leinster 42-10 Benetton | RDS Arena | 7:35 p.m. |
| UNITED RUGBY C’SHIP | Fri Sept 30 | Ulster 13-20 Leinster | Kingspan Stadium | 7:35 p.m. |
| UNITED RUGBY C’SHIP | Sat Oct 8 | Leinster 54-34 Sharks | RDS Arena | 5:05 p.m. |
| UNITED RUGBY C’SHIP | Fri Oct 14 | Connacht 0-10 Leinster | Sportsground | 7:35 p.m. |
| UNITED RUGBY C’SHIP | Sat Oct 22 | Leinster 27-13 Munster | Aviva Stadium | 5:15 p.m. |
| UNITED RUGBY C’SHIP | Fri Oct 28 | Scarlets 5-35 Leinster | Parc y Scarlets | 7:35 p.m. |
| AUTUMN NATIONS SERIES | Sat Nov 5 | IRELAND 19-16 SOUTH AFRICA | Aviva Stadium | 5:30 p.m. |
| AUTUMN NATIONS SERIES | Sat Nov 12 | IRELAND 35-17 FIJI | Aviva Stadium | 1:00 p.m. |
| AUTUMN NATIONS SERIES | Sat Nov 19 | IRELAND 13-10 AUSTRALIA | Aviva Stadium | 8:00 p.m. |
| UNITED RUGBY C’SHIP | Sat Nov 26 | Leinster 40-5 Glasgow | RDS Arena | 3:15 p.m. |
| UNITED RUGBY C’SHIP | Sat Dec 3 | Leinster 38-29 Ulster | RDS Arena | 7:35 p.m. |
| CHAMPIONS CUP | Sat Dec 10 | Racing 92 10-42 Leinster | Stade Oceane | 1:00 p.m. |
| CHAMPIONS CUP | Fri Dec 16 | Leinster 57-0 Gloucester | RDS Arena | 8:00 p.m. |
| UNITED RUGBY C’SHIP | Mon Dec 26 | Munster 19-20 Leinster | Thomond Park | 7:35 p.m. |
| UNITED RUGBY C’SHIP | Sun Jan 1 | Leinster 41-12 Connacht | RDS Arena | 7:35 p.m. |
| UNITED RUGBY C’SHIP | Sat Jan 7 | Ospreys 19-24 Leinster | Swansea.com Stadium | 7:35 p.m. |
| CHAMPIONS CUP | Sat Jan 14 | Gloucester 14-42 Leinster | Kingsholm | 1:00 p.m. |
| CHAMPIONS CUP | Sat Jan 21 | Leinster 36-10 Racing 92 | Aviva Stadium | 3:15 p.m. |
| UNITED RUGBY C’SHIP | Sat Jan 28 | Leinster 38-14 Cardiff | RDS Arena | 5:00 p.m. |
| SIX NATIONS 2023 | Sat Feb 4 | WALES 10-34 IRELAND | Principality Stadium | 2:15 p.m. |
| SIX NATIONS 2023 | Sat Feb 11 | IRELAND 32-19 FRANCE | Aviva Stadium | 2:15 p.m. |
| UNITED RUGBY C’SHIP | Sat Feb 18 | Leinster 43-14 Dragons | RDS Arena | 7:35 p.m. |
| SIX NATIONS 2023 | Sat Feb 25 | ITALY 20-34 IRELAND | Stadio Olimpico | 2:15 p.m. |
| UNITED RUGBY C’SHIP | Sat Mar 4 | Edinburgh 27-47 Leinster | DAM Health Stadium | 5:05 p.m. |
| SIX NATIONS 2023 | Sun Mar 12 | SCOTLAND 7-22 IRELAND | Murrayfield | 3:00 p.m. |
| SIX NATIONS 2023 | Sat Mar 18 | IRELAND 29-16 ENGLAND | Aviva Stadium | 5:00 p.m. |
| UNITED RUGBY C’SHIP | Fri Mar 24 | Leinster v Stormers | RDS Arena | 7:35 p.m. |
| CHAMPIONS CUP | Sat Apr 1 | Leinster v Ulster | Aviva Stadium | 5:30 p.m. |
| CHAMPIONS CUP | Quarterfinal | |||
| UNITED RUGBY C’SHIP | Sat Apr 15 | Lions v Leinster | Emirates Airline Park | 1:00 p.m. |
| UNITED RUGBY C’SHIP | Sat Apr 22 | Bulls v Leinster | Loftus Versfeld | 3:15 p.m. |
| CHAMPIONS CUP | Semifinal | |||
| UNITED RUGBY C’SHIP | Leinster v TBC | TBC | TBC | |
| UNITED RUGBY C’SHIP | Semifinal | |||
| CHAMPIONS CUP | Sat May 20 | FINAL | ||
| UNITED RUGBY C’SHIP | Sat May 27 | FINAL |
HARPIN' ON RUGBY 