United Kingdom
- Sir Robert Williams, 2nd Baronet (c. 1627–1678), Member of Parliament for Carnarvonshire, 1656–1658, and for Carnarvon Boroughs, 1659
- Robert Williams (d. 1763) (c. 1695–1763), Member of Parliament for Montgomeryshire, 1740–1741 and 1742–1747
- Sir Robert Williams, 9th Baronet of Penryn (1764–1830), Member of Parliament for Carnarvonshire, 1790–1826, and for Beaumaris, 1826–1831
- Robert Williams (1735–1814), Member of Parliament for Dorchester 1807–1812
- Robert Williams (1767–1847), Member of Parliament for Wootton Basset, 1802–1807, Grampound, 1808, Kilkenny, 1809–1812, and Dorchester, 1812–1835
- Robert Williams (hymn-writer) (1782–1818), blind hymn-writer from Anglesey
- Robert Williams (1811–1890), Member of Parliament for Dorchester, 1835–1841
- Sir Robert Williams, 1st Baronet, of Bridehead (1848–1943), Conservative Member of Parliament for West Dorset, 1895–1922, son of the above
- Sir Robert Williams, 1st Baronet, of Park (1860–1938), Scottish mining engineer, explorer of Africa, and railway developer in Angola
- Robert Williams town, former town name in Angola, named after Sir Robert Williams, 1st Baronet, of Park
- Robert Williams (Archdeacon of Carmarthen) (1863–1938), professor of history and archdeacon
- Robert Williams (trade union leader) (1881–?), British trade union organiser
- Robert Williams (cricketer) (born 1970), former English cricketer
- Robert Williams (Trebor Mai) (1830–1877), Welsh language poet
- Bertie Williams (1907–1968), Bristol City, Sheffield United and Wales international footballer
- Robert Williams (chemist) (born 1926), Emeritus Professor of Oxford University
- Robbie Williams (born 1974), British pop singer
- Robbie Williams (footballer born 1979), footballer who plays for Southport
- Robbie Williams (footballer born 1984), footballer who plays for Plymouth Argyle
- Rob Williams (comics), British comic writer
- Rob Williams (entrepreneur) (1979–2009), sports enthusiast and partner of business Dolphin Music
- Rob Williams (rower) (born 1985), British rower
- Robert Williams (racehorse trainer)
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Famous quotes containing the words united and/or kingdom:
“The real charm of the United States is that it is the only comic country ever heard of.”
—H.L. (Henry Lewis)
“I was a child and she was a child,
In this kingdom by the sea;
But we loved with a love which was more than love --
I and my Annabel Lee.”
—Edgar Allan Poe (1809–1845)