Kacey Mottet Klein ([keˌsimoˌtɛˈklɛ̃], * 20. Oktober 1998 in Bussigny-près-Lausanne) ist ein Schweizer Schauspieler aus dem Kanton Waadt. ()
Kacey Mottet Klein is a Swiss actor. He made his screen acting debut at the age of ten in Ursula Meier's "Home", winning a Swiss Film Award for Best Emerging Talent. He followed this with another Swiss Film Award for Best Actor and a César nomination for the lead in Meier's "Sister".