Malcolm David Kelley, sometimes credited as just Malcolm Kelley, is an American rapper, singer, songwriter, and actor best known for portraying the character Walt Lloyd on the ABC series Lost and as one half of the pop duo MKTO.

Walter "Walt" Lloyd is a fictional character portrayed by Malcolm David Kelley in the American ABC television series Lost. The series follows the lives of over forty survivors of the crash of Oceanic Flight 815. Walt is introduced in the pilot episode as one of the survivors aboard the plane, which crashes onto the island where most of the program takes place. He is the 10-year-old son of Michael Dawson.