| The Flash | |
|---|---|
| Season 4 | |
 Home media cover | |
| Showrunners | |
| Starring | |
| No. of episodes | 23 |
| Release | |
| Original network | The CW |
| Original release | October 10, 2017 – May 22, 2018 |
| Season chronology | |
The fourth season of the American television series The Flash, which is based on the DC Comics character Barry Allen / Flash, premiered on The CW on October 10, 2017, and ran for 23 episodes until May 22, 2018. The season follows Barry, having returned from his self-imposed stay in the Speed Force, as he faces down Clifford DeVoe / Thinker. It is set in the Arrowverse, sharing continuity with the other television series of the universe, and is a spin-off of Arrow. The season is produced by Berlanti Productions, Warner Bros. Television, and DC Entertainment, with Andrew Kreisberg and Todd Helbing serving as showrunners.
The season was ordered in January 2017, and filming began that July. Grant Gustin stars as Barry, with principal cast members Candice Patton, Danielle Panabaker, Carlos Valdes, Keiynan Lonsdale, Tom Cavanagh, and Jesse L. Martin also returning from previous seasons, and are joined by Neil Sandilands. The series was renewed for a fifth season on April 2, 2018.[1]