The sixth season of the American television series The Flash, based on the DC Comics character Barry Allen / The Flash, premiered on the CW on October 8, 2019. The season follows Barry, a crime scene investigator with superhuman speed who fights criminals, including others who have also acquired superhuman abilities. It is set in the Arrowverse, sharing continuity with other TV series in the universe, and is a spin-off of Arrow. The season is produced by Berlanti Productions, Warner Brothers Television, and DC Entertainment with Eric Wallace as showrunner.
The season was ordered in January 2019, and was originally planned to have 22 episodes. Filming began in July of that year, and production was shut down in March 2020 due to the COVID-19 pandemic, leaving the season with only 19 episodes. Grant Gustin stars as Barry, and main cast members Candice Patton, Daniel Panabaker, Carlos Valdez, Hartley Sawyer, Danielle Nicolette, Tom Kavanagh, and Jesse L. Martin also return from previous seasons, while LaMonica Garrett was promoted to series regular due to her guest status in season five. They are joined by new cast member Efrat Dor, and former series regular Keynan Lonsdale makes a guest appearance. The series was renewed for a seventh season on January 7, 2020.