Leinster will begin their Heineken Champions Cup campaign with the visit of Benetton to the RDS on Saturday 16 November.
Leo Cullen's side will then hit the road for away trips to Lyon and Northampton before the reverse fixtures in Pool 1 as they look to make the final for a third successive season.
Last year's beaten semi-finalists Munster will follow them on Saturday evening with a showdown with the Ospreys in Swansea.
The following weekend ex-Reds winger Simon Zebo will return to Thomond Park with French heavyweights Racing 92 for an evening kick off.
Munster will then welcome the reigning champions Saracens to Limerick as Mark McCall's side look to win the competition for the fourth time in five seasons.
Meanwhile, in Galway, there is sure to be a sell-out crowd at the Sportsground as Connacht return to the top tier of European rugby with Montpellier coming to town on Sunday, 17 November.
The Westerners will follow that with away trips to Toulouse and Gloucester in Pool 5 before the reverse fixtures.
Ulster will open up their campaign at the Recreation Ground against Bath before they face into two home fixtures with Clermont Auvergne and Harlequins.
The pool stages conclude on the second and third weekends of January 2020 with the Stade de Marseille hosting the Challenge Cup final on Friday, May 22 before the Heineken Champions Cup final on Saturday, May 23.
Leinster pool fixtures
Saturday, 16 November
Leinster v Benetton, 3.15pm, RDS Arena (BT Sport)
Saturday 23 November
Lyon v Leinster, 4.15pm, Matmud Stadium de Gerland (BT Sport)
Saturday, 7 December
Northampton Saints v Leinster, 1pm, Franklin Gardens (Channel 4/BT Sport)
Saturday, 14 December
Leinster v Northampton Saints, 5.15pm, Aviva Stadium (Channel 4/BT Sport)
Saturday, 11 January
Leinster v Lyon, 1pm, RDS Arena (BT Sport)
Saturday, 18 January
Benetton v Leinster, 2pm, Stadio Comunale di Monigo (BT Sport)
Munster pool fixtures
Saturday, November 16
Ospreys v Munster, 5.30pm, Liberty Stadium (BT Sport)
Saturday, November 23
Munster v Racing 92, Thomond Park, 5.30pm – BT Sport & beIN Sports
Saturday, December 7
Munster v Saracens, 5.30pm, Thomond Park, (BT Sport)
Saturday, December 14
Saracens v Munster, 3pm Allianz Park (BT Sport)
TBC Saturday/Sunday, January 11/12
Racing 92 v Munster, TBC
Sunday, January 19
Munster v Ospreys, 1pm, Thomond Park (BT Sport)
Connacht pool fixtures
Sunday, 17 November
Connacht v Montpellier, 1pm, The Sportsground, (BT Sport)
Saturday, 23 November
Toulouse v Connacht, 2pm, Stade Ernest Wallon (BT Sport)
Sunday, 8 December
Gloucester v Connacht, 1pm, Kingsholm Stadium (BT Sport)
Saturday, 14 December
Connacht v Gloucester, 12.45pm, The Sportsground (BT Sport)
Saturday, 11 January
Connacht v Toulouse, 3.15pm, The Sportsground (BT Sport)
Sunday, 19 January
Montpellier v Connacht, 4.15pm, GGL Stadium (BT Sport)
Ulster pool fixtures
Saturday, 16 November
Bath v Ulster, 1.00pm, Recreation Ground (Channel 4/BT Sport)
Friday, 22 November
Ulster v ASM Clermont Auvergne, 7.45pm, Kingspan Stadium (BT Sport)
Saturday, 7 December
Ulster v Harlequins, 3.15pm, Kingspan Stadium (BT Sport)
Friday, 13 December
Harlequins v Ulster, 7.45pm, The Twickenham Stoop (BT Sport)
11/12 January
ASM Clermont Auvergne v Ulster, TBC, Stade Marcel-Michelin (BT Sport)
Saturday, 18 January
Ulster v Bath, 3.15pm, Kingspan Stadium (BT Sport)
2019/2020 Heineken Champions Cup pools
Pool 1: Leinster Rugby, Lyon, Northampton Saints, Benetton Rugby
Pool 2: Exeter Chiefs, Glasgow Warriors, La Rochelle, Sale Sharks
Pool 3: ASM Clermont Auvergne, Ulster Rugby, Harlequins, Bath Rugby
Pool 4: Saracens, Munster Rugby, Racing 92, Ospreys
Pool 5: Toulouse, Gloucester Rugby, Connacht Rugby, Montpellier
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