Round one
Friday, 2 October
Zebre v Cardiff Blues, Stadio Lanfranchi, 18:00 BST
Ulster v Benetton, Kingspan Stadium, 20:15 BST
Leinster v Dragons, RDS Arena, 20:15 BST
Saturday, 3 October
Scarlets v Munster, Parc y Scarlets, 15:00 BST
Connacht v Glasgow, The Sportsground, 17:15 BST
Edinburgh v Ospreys, BT Murrayfield, 19:35 BST
Round two
Friday, 9 October
Dragons v Zebre, Rodney Parade, 20:15 BST
Saturday, 10 October
Benetton v Leinster, Stadio Monigo, 17:15 BST
Ospreys v Ulster, Liberty Stadium, 17:15 BST
Munster v Edinburgh, Thomond Park, 19:35 BST
Cardiff Blues v Connacht, tbc, 19:35 BST
Sunday, 11 October
Glasgow v Scarlets, Scotstoun, 17:15 BST
Round three
Friday, 23 October
Leinster v Zebre, RDS Arena, 19:35 BST
Benetton v Scarlets, Stadio Monigo, 20:15 BST
Saturday, 24 October
Ospreys v Glasgow, Liberty Stadium, 17:30 BST
Sunday, 25 October
Ulster v Dragons, Kingspan Stadium, 15:00 BST
Edinburgh v Connacht, BT Murrayfield, 19:35 BST
Monday, 26 October
Munster v Cardiff Blues, Thomond Park, 20:15 BST
Round four
Sunday, 1 November
Dragons v Munster, Rodney Parade, 14:00 GMT
Connacht v Benetton, The Sportsground, 16:30 GMT
Scarlets v Edinburgh, Parc y Scarlets, 18:45 GMT
Monday, 2 November
Cardiff Blues v Ulster, tbc, 18:00 GMT
Zebre v Ospreys, Stadio Lanfranchi, 19:15 GMT
Glasgow v Leinster, Scotstoun, 20:15 GMT
Round five
Saturday, 7 November
Benetton v Munster, Stadio Monigo, 14:00 GMT
Dragons v Connacht, Rodney Parade, 17:15 GMT
Sunday, 8 November
Ospreys v Leinster, Liberty Stadium, 15:00 GMT
Scarlets v Zebre, Parc y Scarlets, 17:15 GMT
Monday, 9 November
Edinburgh v Cardiff Blues, BT Murrayfield, 20:15 GMT
Ulster v Glasgow, Kingspan Stadium, 20:15 GMT
Round six
Saturday, 14 November
Connacht v Scarlets, The Sportsground, 19:35 GMT
Sunday, 15 November
Munster v Ospreys, Thomond Park, 14:45 GMT
Glasgow v Dragons, Scotstoun, 18:30 GMT
Monday, 16 November
Zebre v Ulster, Stadio Lanfranchi, 18:00 GMT
Cardiff Blues v Benetton, tbc, 20:15 GMT
Leinster v Edinburgh, RDS Arena, 20:15 GMT
Round seven
Sunday, 22 November
Zebre v Connacht, Stadio Lanfranchi, 14:30 GMT
Ospreys v Benetton, Liberty Stadium, 15:00 GMT
Leinster v Cardiff Blues, RDS Arena, 17:15 GMT
Ulster v Scarlets, Kingspan Stadium, 19:35 GMT
Monday, 23 November
Dragons v Edinburgh, Rodney Parade, 18:00 GMT
Glasgow v Munster, Scotstoun, 20:15 GMT
Round eight
Saturday, 28 November
Connacht v Ospreys, The Sportsground, 19:35 GMT
Sunday, 29 November
Scarlets v Leinster, Parc y Scarlets, 17:15 GMT
Cardiff Blues v Glasgow, tbc, 19:35 GMT
Monday, 30 November
Benetton v Dragons, Stadio Monigo, 18:00 GMT
Munster v Zebre, Thomond Park, 20:15 GMT
Edinburgh v Ulster, BT Murrayfield, 20:15 GMT.
Round 9
December 26/27
Connacht v Ulster
Munster v Leinster
Zebre v Benetton
Glasgow v Edinburgh
Dragons v Cardiff Blues
Ospreys v Scarlets
Round 10
January 2/3, 2021
Leinster v Connacht
Ulster v Munster
Benneton v Zebre
Edinburgh v Glasgow
Cardiff Blues v Ospreys
Scarlets v Dragons
Round 11
January 9/10
Connacht v Munster
Leinster v Ulster
Zebre v Edinburgh
Glasgow v Benetton
Cardiff Blues v Scarlets
Dragons v Ospreys