Robert, Rob, Robbie, Bob or Bobby Williams may refer to:

Entertainment

Film

* Robert Williams (actor, born 1894) (1894–1931), American stage and film actor * Robert B. Williams (actor) (1904–1978), American film actor * R. J. Williams (born 1978), American former child actor and later internet entrepreneur * Rob Williams (filmmaker), American film director

Music

* Robert Pete Williams (1914–1980), American blues guitarist * Chocolate Williams (Robert Williams Jr., 1916–1984), jazz bassist and blues vocalist * Bob Williams (singer) (1918–2003), American singer and one of the Williams Brothers * Robert Williams (singer) (1949–2022), Greek singer and composer * Robert S. Williams (born 1949), bassoon player of the Detroit Symphony Orchestra * Robert Williams (drummer) (born 1955), Captain Beefheart, Hugh Cornwell, and solo * Robbie Williams (born 1974), British pop singer and former member of Take That * Rob Williams (1979–2009), partner of business Dolphin Music * Meek Mill (Robert Rihmeek Williams, born 1987), American rapper

Writers

* Robert Williams (poet) (1744–1815), Welsh poet * Robert Williams (Robert ap Gwilym Ddu) (1767–1850), Welsh-language poet * Robert Williams (Trebor Mai) (1830–1877), Welsh-language poet * Robert Moore Williams (1907–1977), American science fiction novelist * Robert Williams (artist) (born 1943), cartoonist and painter * Rob Williams (comics), British comic writer

Military

* Robert Williams (Royal Navy officer) (1765–1827) English rear-admiral in the Royal Navy * Robert Williams (adjutant general) (1829–1901), American brigadier general and Adjutant General of the US Army * Robert Williams (Medal of Honor) (1837–unknown), American sailor and Medal of Honor recipient * Robert B. Williams (general) (1901–1977), World War II major general in the United States Army Air Forces * Robert H. Williams (soldier) (1908–1983), American Marine brigadier general

Politics

UK

* Sir Robert Williams, 2nd Baronet (c. 1627–1678), MP for Carnarvonshire, 1656–1658, and for Carnarvon Boroughs, 1659 * Robert Williams (died 1763) (1695–1763), MP for Montgomeryshire, 1740–1741 and 1742–1747 * Robert Williams (1735–1814) (1735–1814), MP for Dorchester, 1807–1812 * Sir Robert Williams, 9th Baronet (1764–1830) of Penryn, MP for Carnarvonshire, 1790–1826, and for Beaumaris, 1826–1831 * Robert Williams (1767–1847) (1767–1847), MP for Dorchester, 1812–1835 * Robert Williams (1811–1890) (1811–1890), MP for Dorchester, 1835–1841 * Sir Robert Williams, 1st Baronet, of Bridehead (1848–1943), Conservative MP for West Dorset, 1895–1922

US

* Robert Williams (Mississippi politician) (1773–1836), Governor of the Mississippi Territory * Robert P. Williams (1841–1910), State Treasurer of Missouri, 1901–1905 * Robert L. Williams (1868–1948), American politician, governor of Oklahoma * Robert R. Williams, List of mayors of Miami, mayor of Miami, 1937–1939 * Bo Williams (Robert Warren Williams, born 1938), mayor of Shreveport, Louisiana * Bob Williams (West Virginia politician) (born 1951), American politician and state senator in West Virginia * Bob Williams (Washington politician), member of the Washington House of Representatives * Robert Q. Williams (born 1964), member of the South Carolina House of Representatives

Elsewhere

* Robert Wynn Williams (1864–1929), member of the Queensland Legislative Assembly, Australia * Robert Williams (Victorian politician) (1870–1938), Australian politician * Robert Arthur Williams (born 1933), consultant and political figure in British Columbia, Canada * Robbie Williams (politician) ( 1960–2007), Australian politician

Religion

* Robert Williams (antiquary) (1810–1881), Welsh Anglican clergyman and Celtic scholar * Robert Williams (archdeacon of Carmarthen) (1863–1938), Welsh historian and Anglican priest * Robert Dewi Williams (1870–1955), Welsh schoolteacher, Presbyterian minister, and author * Robert Williams (archdeacon of Gower) (born 1951), Welsh Anglican priest * Robert Williams (American priest) (1955–1992), first openly gay male priest in the American Episcopal Church

Science

* Robert Statham Williams (1859–1945), American bryologist * Sir Robert Williams, 1st Baronet, of Park (1860–1938), Scottish mining engineer, explorer, and railway developer * Robert R. Williams (1886–1965), American chemist who first synthesized vitamin B₁ * Robert Hardin Williams (1909–1979), American endocrinologist and diabetologist * Robert Williams (physician) (1916–2003), Welsh pathologist * Robin Williams (mathematician) (1919–2013), New Zealand mathematician, university administrator and civil servant * Robert Williams (English chemist) (1926–2015), Professor of Oxford University * Robert Williams (psychologist) (born 1930), second president of the Association of Black Psychologists * Robert Williams (astronomer) (born 1940), director of STScI 1993–98; president of IAU, 2009–2012 * Robin Williams (physicist) (Robert Hughes Williams, born 1941), Welsh physicist and academic * Robert H. Williams (physicist), environmental scientist at the Princeton Environmental Institute * Bobby G. Williams (born 1951), Jet Propulsion Laboratory engineer; namesake of asteroid 5642 Bobbywilliams

Sports

American football

* Bob Williams (coach) (1877–1957), American college football coach * Bob Williams (quarterback) (1930–2016), football player for Notre Dame * Bobby Williams (defensive back) (1942–2012), American pro football player, St. Louis Cardinals and the Detroit Lions * Bob Williams (American football coach), at Livingston State Teachers College, now University of West Alabama, 1952 * Robert Williams (quarterback), football player for Notre Dame, 1956–1958 * Bobby Williams (born 1958), tight end, coach * Robert Williams (cornerback) (born 1962), former American football cornerback * Bobbie Williams (born 1976), American football guard * Robert Williams (defensive back) (born 1977), former American football cornerback

Baseball

* Bob Williams (baseball) (1884–1962), baseball player for the New York Highlanders/Yankees * Bobby Williams (baseball) (1895–1978), American baseball shortstop and manager in the Negro leagues * Robert Williams (baseball) (1917–2000), American baseball pitcher and infielder in the Negro leagues

Basketball

* Bob Williams (basketball, born 1931), American professional basketball player, played collegiately at Florida A&M * Bob Williams (basketball, born 1953), American basketball coach, most recently with UC Santa Barbara * Rob Williams (basketball) (1961–2014), American professional basketball player, played collegiately for Houston * Robert Williams III (born 1997), American professional basketball player, played collegiately for Texas A&M * Robert Williams (Grambling State basketball), American college basketball player for Grambling State

Cricket

* Robert Williams (South African cricketer) (1912–1984), South African cricketer * Robert Williams (English cricketer) (born 1970), English former cricketer * Robbie Williams (cricketer) (born 1987), English cricketer for Middlesex

Football and rugby

* Bobbie Williams (rugby union) (1865–1967), Welsh international rugby union player * Bobby Williams (Scottish footballer) (died 1916), Scottish footballer * Bob Williams (rugby) (1886–1969), Australian rugby league footballer * Bob Williams (Australian rules footballer) (1913–2004), Australian rules footballer with Hawthorn * Bobby Williams (footballer, born 1932), English footballer for Chester City * Bobby Williams (footballer, born 1940), English footballer * Robbie Williams (footballer, born 1979), English footballer for Warrington Town * Robbie Williams (footballer, born 1984), English footballer for Limerick * Robert Williams (footballer, born 1927), English footballer for Wrexham and Shrewsbury Town * Robert Williams (footballer, born 1932), English footballer for Mansfield Town

Other sports

* Robert Williams (archer) (1841–1914), American archer * Bob Williams (rower) (1931–2017), Canadian rower * Robbie Williams (snooker player) (born 1986), English snooker player * Rob Williams (rower, born 1960), British rower * Rob Williams (rower, born 1985), British Olympian

Other

* Robert A. Williams Jr., American lawyer and professor * Robert S. C. Williams, community service worker in Ontario, Canada * Robert C. Williams, the namesake of the Robert C. Williams Paper Museum * Robert F. Williams (1925–1996), American civil rights activist * Robert Wayne Williams (1952–1983), American murderer executed in Louisiana * Robert Williams (architect) (1848–1918), Welsh architect and social campaigner * Robert Williams (geometer) (born 1942), American designer, mathematician, and architect * Robert Williams (robot fatality) (1953–1979), the first person to be killed by a robot * Robert Williams (trade union leader) (1881–1936), British trade union organizer * Robert D. Williams, American businessman