Roy Williams was an artist and entertainer for The Walt Disney Studios, perhaps best known as "Big Roy," the adult mouseketeer for four seasons on the Mickey Mouse Club television series.

Williams was born in Colville, Washington and raised in Los Angeles, where he attended Fremont High School. After graduating, he was hired as an artist by Walt Disney in 1930. He worked on animated shorts while attending Chouinard Art Institute at night. He later also developed story ideas for Disney. He also designed over 100 insignias for the U.S. armed forces during World War II, and is credited with designing the mouse ears worn on the Mickey Mouse Club.

Williams died in Burbank, California, in 1976. He was posthumously inducted as a Disney Legend in 1992.