This is a list of player transfers involving Premiership Rugby teams before or during the 2020–21 season. The list is of deals that are confirmed and are either from or to a rugby union team in the Premiership during the 2019–20 season. It is not unknown for confirmed deals to be cancelled at a later date. On 19 January 2020, Saracens are automatically relegated to the RFU Championship due to salary cap breaches. On 2 April 2020, Newcastle Falcons were automatically promoted back to the Premiership to replace relegated Saracens under the RFU's 'best record playing formula' and due to the COVID-19 pandemic.