2021 St. George Illawarra Dragons season

The 2021 St. George Illawarra Dragons season was the 23rd in the joint venture club's history. The Dragons' men's team competed in the NRL's 2021 Telstra Premiership season. The women's team, was scheduled to play their fourth season in the NRLW's 2021 Telstra Women's Premiership season, however that has since been postponed to 2022.