Iain Armitage (born July 15, 2008) 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, from 2017 to 2024. He also played Ziggy Chapman in Big Little Lies (2017–2019) and voiced young Shaggy Rogers in Scoob! (2020), Chase in Paw Patrol: The Movie (2021) and the sequel PAW Patrol: The Mighty Movie (2023).