Chelah Horsdal is a Canadian actress. She is known for her regular roles in the television series Hell on Wheels, When Calls the Heart, and The Man in the High Castle, recurring roles on Stargate SG-1, Level Up, Arrow, and Star Trek: Discovery, and for her roles in the films Aliens vs. Predator: Requiem and Rise of the Planet of the Apes. Horsdal was born in Vancouver, British Columbia. She says she "was born to hippie parents while surrounded by friends and family on the 'farm' Headacres."

She is the daughter of mother Lindsay and folksinger father Valdy. She grew up with her mother in Kitsilano and attended Bayview Elementary followed by Lord Byng Secondary. She began modelling in locally shot TV shows and commercials at 18, and then lived in the Caribbean for a year.