The 2019–20 European Rugby Champions Cup pool stage is the first stage of the 25th season of European club rugby union, and the sixth under the European Rugby Champions Cup format.

For the purpose of creating the tiers, clubs are ranked based on their domestic league performances and on their qualification for the knockout phases of their championships, so a losing quarter-finalist in the Top 14 would be seeded below a losing semi-finalist, even if they finished above them in the regular season.

[2] Teams in the same pool play each other twice, at home and away, in the group stage that begins on the weekend of 15–17 November 2019, and continues through to 17–19 January 2020.

The five pool winners and three best runners-up progress to the quarter-finals.

Teams are awarded group points based on match performances.