The 2019 Rugby World Cup was an international rugby union tournament which was held in Japan from 20 September until 2 November 2019. Twenty national teams competed, and each brought a 31-man squad containing no regulated number of players per-position to the tournament. The tournament was administered by World Rugby, to whom each team submitted their finalised squad by 8 September 2019. A player may be replaced for medical or compassionate reasons, but would be unable to return to the squad. Any replacement player has an enforced stand-down period of 48 hours before they can take the field.
Players marked (c) were named as captain for their national squad.
The age listed for each player is on 20 September 2019, the first day of the tournament. The numbers of caps for each player do not include any matches played after the start of tournament.