Robert or Bob Miller may refer to:
- Robert Byron Miller (1825–1902), English-born lawyer and politician in colonial Tasmania
- Robert A. Miller (Oregon politician) (1854–1941), American politician in Oregon
- Robert Thomas Miller (1893–1962), mayor of Austin, Texas
- Robert Hopkins Miller (1927-2017), American diplomat
- Bob Miller (Australian politician) (born 1941), Victorian state MP
- Bob Miller (Nevada governor) (born 1945), governor of Nevada
- Robert Edmond Miller (born 1947), Jamaican diplomat
- Bob Miller (Alaska politician) (born 1953), American journalist, media personality and politician
- R. Burnett Miller (1923–2018), mayor of Sacramento, California
- Robert Miller (Jamaican politician), member of parliament
- Robert Francis Miller, Canadian politician
- Robert Miller (English politician), member of parliament
Baseball
- Bob Miller (pitcher, born 1868) (1868–1931), pitcher in 1890–91
- Bob Miller (second baseman), second baseman from 1923 to 1932
- Bob Miller (pitcher, born 1926) (1926–2020), pitcher for the Philadelphia Phillies from 1949 to 1958
- Bob Miller (pitcher, born 1935), pitcher from 1953 to 1962
- Bob Miller (pitcher, born 1939) (1939–1993), right-handed pitcher from 1957 to 1974
- Bobby Miller (baseball) (born 1999), pitcher for the Los Angeles Dodgers