This is a list of player transfers involving Premiership Rugby teams before or during the 2021–22 season. The list is of deals that are confirmed and are either from or to a rugby union team in the Premiership during the 2020–21 season. It is not unknown for confirmed deals to be cancelled at a later date. On 20 June, Saracens were promoted to Premiership Rugby for the 2021–22 season after defeating Ealing Trailfinders in the RFU Championship promotion playoff. No team is relegated from the Premiership this season due to an increase in the number of teams in the Premiership for 2021–22 season.