Rachel Rye Keller (born December 25, 1992) 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.

Early life
Keller was born in Los Angeles, and grew up in Saint Paul, Minnesota. She attended the Saint Paul Conservatory for Performing Artists and graduated in 2014 from Carnegie Mellon University. Keller's father is Jewish, and she also celebrates Hanukkah.