Rachel Rye Keller is an American actress, best known for her roles as Sydney "Syd" Barrett in the FX television series Legion and as Simone Gerhardt in the second season of the FX black comedy crime drama anthology series Fargo.

[2][3] She attended the Saint Paul Conservatory for Performing Artists and graduated in 2014 from Carnegie Mellon University.

Keller received wide recognition for her recurring role as Simone Gerhardt in the second season of the FX anthology television series Fargo.

[6] Between 2017 and 2019, she starred as Sydney "Syd" Barrett, the female lead in the FX series Legion.

In 2022, she had a leading role in the HBO Max series Tokyo Vice, replacing Odessa Young.