Munster Rugby will kick off their 2023 Champions Cup campaign hosting Bayonne at Thomond Park on December 9th.
Round two will see Graham Rowntree's team on the road to recent winners Exeter at Sandy Park on December 17th.
On January 13th, they are away once again when they face three-time champions Toulon at Stade Félix Mayol on January 13th.
Their final group outing will be back in Thomond Park when they welcome old rivals Northampton Saints on January 20th.
Leinster will begin their campaign away to reigning champions La Rochelle, Connacht face Bordeaux and Ulster take on Bath.
The knockout rounds kick off in the first week of April, with the final being contested on May 25th at the Tottenham Hotspur Stadium in London.
The full list of fixtures can be found here.