The 2021 Philadelphia Phillies season was the 139th season in the history of the franchise, and its 18th season at Citizens Bank Park. With a loss to the Braves on September 30, they were eliminated from postseason contention for the tenth straight season. This was the first season since exactly a decade earlier in 2011 when the Phillies would finish a season with a winning record, which they clinched with a 5-0 victory over the Miami Marlins on October 1.