If my sources are correct, Jimmy MacDonald.
Walt Disney himself did the voice for Mickey Mouse.
Mickey Mouse. He was Mickey's voice actor during his time.
Mickey Mouse was voiced by Walt Disney from his creation in 1928 until 1947.
Mickey Mouse
The current voice of Mickey Mouse is Bret Iwan who succeeded the role after longtime voice actor Wayne Allwine died in 2009. Also, Walt Disney, himself, did Mickey's voice from 1928 to 1947, until Jimmy MacDonald took over 1947 to 1977.
Walt Disney
Walt was not only the creator of Mickey Mouse, but he was the famous cartoon character's voice for many years.
In the early cartoons, Walt Disney himself played the voice of Mickey! :)
Walt Disney provided the voice himself, until his later years. As a heavy smoker, Walt found it harder and harder to do the voice of Mickey as time went on.
Mickey Mouse is the most recognized and iconic character created by Walt Disney animation studios. He is best recognized for his ears, which can be found all over the theme parks, in the backgrounds of movies, and on merchandise.
The current voice of Mickey Mouse is Bret Iwan. He was first called in to be the voice of Mickey Mouse shortly after the death of Wayne Allwine on May 18, 2009. Bret has published his personal illustrations of Mickey Mouse on his official blogs, and first recorded dialog for Mickey Mouse for the 2009 Disney On Ice: Celebrations. Iwan voices the character on Mickey Mouse Clubhouse. He will also give his first full voice performance as Mickey Mouse for the English version of the upcoming PlayStation Portable game Kingdom Hearts Birth by Sleep.
Mickey is currently voiced by Bret Iwan. He was previously voiced by Wayne Allwine until his death in 2009.