Iain Armitage is an American actor. He is best known for his role as Sheldon Cooper in Young Sheldon, a spin-off prequel to The Big Bang Theory. He has also voiced in movies such as PAW Patrol: The Movie and Scoob!.

Sheldon Lee Cooper, Ph.D., Sc.D., is a fictional character in the CBS television series The Big Bang Theory and its spinoff series Young Sheldon, portrayed by actors Jim Parsons and Iain Armitage respectively. For his portrayal, Parsons won four Primetime Emmy Awards, a Golden Globe Award, a TCA Award, and two Critics' Choice Television Awards. The character's childhood is the focus of Young Sheldon, in which he grows up in East Texas with his family as a child prodigy.