Barcelona - Friday's Top 14 final between Racing 92 and Toulon at Barcelona's famed Nou Camp attracted a record attendance of 99 124 fans, the organisers announced.
The figure beat the previous best for a rugby club game of 84 068 set at Wembley in March 2015 to see Saracens play Harlequins.
The world record for any rugby game is the 109 874 who saw Australia play New Zealand at the Sydney Olympic Stadium in July 2000.
Former All Blacks legend Dan Carter led Racing 92 to a 29-21 victory.