Robert, Bob or Bobby Smith, or variants thereof, may refer to:
- Robert MacKay Smith (1802–1888), Scottish businessman, meteorologist and philanthropist who founded Glasgow University's Mackay Smith Prizes
- Robert Barr Smith (1824–1915), Australian businessman and philanthropist
- Robert Hall Smith (1888–1960), American railroad executive, president of the Norfolk and Western Railway, 1946–1958
- Robert H. Smith (philanthropist) (1928–2009), American builder and developer who developed much of the Crystal City, Virginia neighborhood just south of Washington, D.C.
- Robert P. Smith (philanthropist) (1940–2019), American financial pioneer, philanthropist and author
- Robert Smith, Baron Smith of Kelvin (born 1944), British businessman, governor of the BBC
- Robert F. Smith (investor) (born 1962), American businessman and investor; founder, chairman, and CEO of Vista Equity Partners
Music
- Robert Archibald Smith (1780–1829), Scottish composer, known for his collection Scotish [sic] Minstrel, a selection from the vocal melodies of Scotland ancient and modern
- Robert Bache Smith (1875–1951), American librettist and lyricist
- Robert Curtis Smith (1930–2010), American Piedmont blues singer, guitarist and songwriter
- Bobby Smith (rhythm and blues singer) (1936–2013), American musician, lead singer of the (Detroit) Spinners
- Robert Weston Smith (1938–1995), known as Wolfman Jack, American disc jockey famous for his gravelly voice
- Bob Smith (1942–1991), founder, singer, keyboardist and drummer for Cat Mother & the All Night Newsboys
- Robert Dean Smith (born 1956), American operatic tenor
- Robert W. Smith (musician) (1958–2023), American composer, arranger and teacher
- Robert Smith (musician) (born 1959), English musician, lead singer and guitarist of The Cure
- Robert L. Smith (recording engineer) (born 1965), American recording engineer and record producer in New York City
- Rob Smith (Irish musician) (born 1982), Irish singer-songwriter and DJ
- Rob Smith (British musician), English contemporary DJ, musician, and remixer
- Rob Sonic, American rapper and record producer
United Kingdom
- Robert Smith (MP for Wycombe), member of parliament (MP) for Wycombe from 1318 to 1322
- Robert Smith (MP for Derby), MP for Derby in 1420 and 1421
- Robert Smith (MP for Devizes) (fl. 1414–1421), MP for Devizes
- Robert Smith (fl. 1545), MP for Carlisle
- Robert Smith, 1st Baron Carrington (1752–1838), MP for Nottingham
- Robert Percy Smith (1770–1845), British lawyer, MP and judge advocate-general of Bengal, India
- Robert Vernon, 1st Baron Lyveden (1800–1873), known as Robert Vernon Smith until 1859, British Liberal Party politician and MP
- Robert Smith (trade unionist) (1862–1934), general secretary of the National Union of Scottish Mineworkers and British Labour Party politician
- Sir Robert Smith, 1st Baronet (1880–1957), Scottish Unionist politician and MP for Aberdeen and Kincardine Central
- Robert Smith (colonial administrator) (1887–1959), British governor of North Borneo
- Sir Robert Smith, 3rd Baronet (born 1958), Liberal Democrat politician and MP for West Aberdeenshire and Kincardine
- Bobby Smith (activist) (born 1982), British political and fathers' rights activist
United States
- Robert Smith (American cabinet member) (1757–1842), secretary of state and of the Navy
- Robert Barnwell Smith (1800–1876), known as Robert Barnwell Rhett, U.S. senator and representative from South Carolina
- Robert Smith (Illinois politician) (1802–1867), U.S. representative from Illinois
- Robert Hardy Smith (1813–1878), Alabama politician and officer of the Confederate States Army during the American Civil War
- Robert Burns Smith (1854–1908), governor of Montana
- Robert Lloyd Smith (1861–1942), educator, businessman, and politician in the Texas Legislature
- Robert B. Smith (Virginia mayor), mayor of Newport News, Virginia 1956–1958
- Robert Solwin Smith (1924–2013), American ambassador to the Côte d'Ivoire
- Robert P. Smith (ambassador) (1929–2012), American diplomat
- Bob Smith (Oregon politician) (1931–2020), U.S. representative from Oregon
- Robert L. Smith (politician) (1931–2024), Republican politician from Idaho
- Bob Smith (New Hampshire politician) (born 1941), U.S. senator from New Hampshire
- Bob Smith (New Jersey politician) (born 1947), New Jersey state senator
- Robert C. Smith (political scientist) (born 1947), political science professor at San Francisco State University
- Robert J. Smith II (born 1963), American attorney and New Jersey state legislator
- Robert Smith (bishop) (1732–1801), English-born American clergyman, planter and prelate of the Episcopal Church who served as the first bishop of the Diocese of South Carolina
- Robert Payne Smith (1818–1895), Regius Professor of Divinity at the University of Oxford and Dean of Canterbury
- Robert Pearsall Smith (1827–1899), lay leader in the Holiness movement in the United States and the Higher Life movement in the United Kingdom
- Robert H. Smith (theologian) (1932–2006), American Lutheran clergyman, theologian, author and lecturer
- Robert Smith (priest) (1932–2010), American Catholic priest, author, and educator
- Robert P. Smith (pastor) (1863–1945), American educator, pastor, and writer
- Robert William Smith (surgeon) (1807–1873), Irish surgeon and pathologist
- Robert Angus Smith (1817–1884), Scottish chemist, discoverer of acid rain
- Robert Murdoch Smith (1835–1900), Scottish engineer, archaeologist and diplomat
- Robert Smith (surgeon) (1840–1885), Sierra Leonean medical doctor and the first African to become a Fellow of the Royal College of Surgeons of Edinburgh
- Bob Smith (doctor) (1879–1950), American physician and surgeon who co-founded Alcoholics Anonymous
- Robert Allan Smith (1909–1980), Scottish physicist
- Robert J. Smith (anthropologist) (1927–2016), Cornell University anthropologist
- Robert H. T. Smith (born 1935), Australian-Canadian professor of geography
- Robert L. Smith (academic), American engineer, academic and author
- Robert Smith (aerospace engineer), American business executive and aerospace engineer
- Robert Smith (footballer, born 1848) (1848–1914), Scottish international footballer born in Aberdeen
- Robert Smith (Darwen footballer), English footballer for Darwen in the 1890s
- Bobby Smith (footballer, born 1870), English footballer born in Stoke-upon-Trent, Staffordshire
- Bobby Smith (footballer, born 1900s), Scottish footballer born in Kirkcaldy, Fife
- Robert Smith (footballer, born 1912), English football player and manager born in Atherton, Lancashire (now Greater Manchester)
- Bob Smith (footballer) (1923-?), English professional footballer born in Walkden, Lancashire (now Greater Manchester)
- Bobby Smith (footballer, born 1933) (1933–2010), English footballer born in Lingdale, North Yorkshire
- Bobby Smith (Irish footballer) (1922–1992), Irish football player
- Bobby Smith (Canadian soccer) (born 1940), Canadian soccer player
- Bobby Smith (footballer, born 1941) (1941–2019), English footballer born in Barnsley, South Yorkshire
- Bobby Smith (footballer, born 1944), English footballer and manager born in Prestbury, Cheshire
- Rob Smith (footballer, born 1950), English footballer born in Kingston upon Hull, East Riding of Yorkshire
- Bobby Smith (American soccer) (born 1951), American soccer player born in Trenton, New Jersey
- Bobby Smith (footballer, born 1953) (1953–2010), Scottish footballer born in Dalkeith, Midlothian
- Rob Smith (soccer) (born 1973), American soccer player born in Wilmington, Delaware
- Bob Smith (defensive back, born 1925) (1925–2002), American football defensive back
- Bob Smith (fullback) (1929–2005), American football fullback
- Bob Smith (halfback) (born 1933), American football halfback
- Bobby Smith (defensive back) (born 1938), American football defensive back
- Bob Smith (American football coach) (born 1940), college football coach
- Bobby Smith (running back) (born 1942), American football running back
- Bob Smith (defensive back, born 1945), American football defensive back
- Rob Smith (American football, born 1957), college football coach
- Rob Smith (Canadian football) (born 1958), Canadian football offensive lineman
- Robert Smith (defensive end) (born 1962), American football defensive end
- Robert Smith (running back) (born 1972), American football running back and sprinter
- Rob Smith (American football, born 1984), American football player
- Robert Smith (safety) (born 1992), American football safety
- Robbie Smith (Canadian football) (born 1997), Canadian football defensive lineman
Baseball
- Bob Smith (catcher) (1907–unknown), Negro league baseball player
- Bob Smith (infielder) (born 1974), infielder for the Tampa Bay Devil Rays
- Bob Smith (pitcher, born 1890) (1890–1965), Major League Baseball (MLB) pitcher for the White Sox, 1913–1915
- Bob Smith (pitcher, born 1895) (1895–1987), MLB pitcher for the Braves, Cubs, and Reds, 1923–1937
- Bob Smith (pitcher, born 1928) (1928–2003), MLB pitcher for the Red Sox, Cubs, and Indians, 1958–1959
- Bob Smith (pitcher, born 1931) (1931–2013), MLB pitcher for the Red Sox, Cardinals, Pirates, and Tigers, 1955–1959
- Bobby Smith (baseball) (1934–2015), MLB outfielder, 1957–1965
- Robert Smith (baseball) (1936–2021), International Baseball Federation president; instrumental in baseball becoming an Olympic sport
- Rob Smith (baseball), American college baseball coach