Marvin Elliott Miller (born Marvin Mueller; July 18, 1913 – February 8, 1985) was an American actor. Possessing a deep baritone voice, he began his career in radio in St. Louis, Missouri before becoming a Hollywood actor. He is remembered for voicing Robby the Robot in the science fiction film Forbidden Planet (1956), a role he reprised in the lesser-known The Invisible Boy (1957).

Born in St. Louis, Miller graduated from Washington University before commencing his career in radio. When a singer named Marvin Miller debuted on another St. Louis radio station, he began using his middle initial to distinguish himself from the newcomer. For the Mutual Broadcasting System, he narrated a daily 15-minute radio show titled The Story Behind the Story, which offered historical vignettes. He also served as announcer on several Old Time Radio shows of the 1940s and 1950s, including The Jo Stafford Show and the long-running mystery series The Whistler.

Miller played Dr. Lee Markham on The Woman in White on NBC radio and Howard Andrews on Midstream on the CBSBlue Network and appeared as "The voice of the Past" on the May 21, 1942 broadcast of The Right to Happiness. In 1945–47, he was the announcer for Songs by Sinatra. He played two characters and was the announcer on The Billie Burke Show (1943–1946).

In 1952, Miller had a one-man program, Armchair Adventures, on CBS Radio. He did "all voices and narration" in the 15-minute dramatic anthology. He also recorded 260 episodes of a program described in a 1950 trade publication as "Marvin Miller: Famous radio voice in series of five-minute vignettes about famous people." The program was syndicated via electrical transcription by The Cardinal Company.