The 2022–23 European Rugby Champions Cup pool stage was the first stage of the 28th season of pan-European professional club rugby union competition, and the ninth under the European Rugby Champions Cup format.
Twenty-four clubs from three major domestic and regional leagues competed over four rounds of pool fixtures, with 16 teams progressing to the knockout stages.
For the first time, teams from South Africa were involved, after qualifying from the inaugural United Rugby Championship season.
The top eight teams in each pool progressed to the round of 16, whilst the teams ranked 9th and 10th progressed to the knockout stages of the 2022–23 European Rugby Challenge Cup.
[3] In the event of a tie between two or more teams, the following tie-breakers were used, as directed by EPCR: