Leinster will open their inaugural European Rugby Champions Cup at home to Wasps at the RDS on Sunday, October 19th, a day after Munster and Ulster open theirs away from home.
At the AJ Bell Stadium on Saturday October 18th, Munster will face Sale (1pm), while Ulster are due at Welford Road (7.45pm) to take on Leicester on the same day.
All 20 games in rounds one and two, confirmed today, will be broadcast on either BT Sport or Sky Sports.
European champions Toulon will kick off their campaign against Scarlets at Stade Mayol on Sunday 19th, while Aviva Premiership champions Northampton Saints face Jonny Sexton's Racing Metro 92 in Paris on the 18th.
Toulon will travel to Ulster for their second round game at Ravenhill a week later, while Munster host Saracensa and Leinster travel to Castres.
The dates and times for rounds three to six are yet to be confirmed.
Connacht will host La Rochelle at The Sportsground on October 18th (5pm) in the opening round of the Challenge Cup before a trip to Sandy park Stadium to face Exeter Chiefs on the 25th.
European Champions Cup
Munster’s fixtures - Pool 1
Sale Sharks v Munster - Sat, October 18th, KO 1pm
Munster v Saracens - Fri, October 24th, KO 7.45pm
Munster v Clermont Auvergne - December 5/6/7
Clermont Auvergne v Munster - December 12/13/14
Saracens v Munster - January 16/17/18
Munster v Sale - January 23/24/25
Leinster’s Fixtures - Pool 2
Leinster v London Wasps - Sun, October 19th, KO 5.15pm
Castres Olympique v Leinster - Sun, October 26th, KO 2pm
Harlequins v Leinster - December 5/6/7
Leinster v Harlequins - December 12/13/14
Leinster v Castres Olympique - January 16/17/18
London Wasps v Leinster - January 23/24/25
Ulster’s Fixtures - Pool 3
Leicester Tigers v Ulster Rugby – Sat, October 18th, KO 7.45pm
Ulster Rugby v Toulon – Sat, October 25th, KO 1pm
Ulster Rugby v Scarlets – December 5/6/7
Scarlets v Ulster – December 12/13/14
Toulon v Ulster – January 16/17/18
Ulster v Leicester Tigers – January 23/24/25
Connacht's Challenge Cup fixtures - Pool 2
Connacht v La Rochelle - Sat, October 18th 5pm
Exeter Chiefs v Connacht - Sat, October 25th, 3pm
Connacht v Bayonne - December 4/5/6/7
Bayonne v Connacht - December 11/12/13/14
Connacht v Exeter Chiefs - January 15/16/17/18
La Rochelle v Connacht - January 22/23/24/25