Others
- Robert Butler (artist) (born 1943), Florida Highwayman artist
- Robert Butler (director) (born 1927), American film and television director
- Robert Neil Butler (1927–2010), American physician and the first director of the National Institute on Aging
- Robert Olen Butler (born 1945), American fiction writer
- Sir Reginald Butler, 1st Baronet (1866–1933), English businessman, whose actual first name was Robert
- Robert Butler (criminal) (1851–1905), New Zealand-Australian career criminal and murderer
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