U.S. •
William Williams (Connecticut politician) (1731–1811), US Continental Congressman •
William M. Williams (Texas politician) (1809–1859), politician in the Texas House and Senate •
William B. Williams (Mississippi politician), served 1870-1871 •
William Williams (Massachusetts politician) (1814–1887), mayor of Gloucester, Massachusetts in 1879 and 1882 •
William Williams (New York politician) (1815–1876), US Representative from New York •
William Williams (Indiana politician) (1821–1896), US Representative from Indiana •
William B. Williams (Michigan politician) (1826–1905), US Representative from Michigan •
William M. Williams Jr. (1846–?), member of the Wisconsin State Assembly •
William E. Williams (1857–1921), U.S. Representative from Illinois •
William R. Williams (1884–1972), US Representative from the state of New York •
William Reid Williams (1866–1931), United States Assistant Secretary of War •
William White Williams (born 1947), American white nationalist •
William Williams (surgeon) (1856–1919), Surgeon General •
William Williams (commissioner) (1862–1947), Commissioner of Immigration, Ellis Island •
William R. Williams (California politician),
California State Treasurer, 1907–1911 •
Bill K. Williams (1943–2019), American politician
UK •
William Peere Williams (1664–1736), Member of Parliament for Bishops Castle (1722–1727) •
Sir William Williams, 6th Baronet (died 1696), Welsh politician •
Sir William Williams, 1st Baronet, of Gray's Inn (1634–1700), Welsh lawyer and politician, speaker of the House of Commons •
Sir William Williams, 2nd Baronet, of Gray's Inn (1665–1740), Welsh politician, Member of Parliament (MP) for Denbigh, 1708–1710 •
William Peere Williams (1664–1736), MP for Bishop's Castle, 1722–1727 •
Sir William Williams, 2nd Baronet, of Clapton (1730–1761), MP for New Shoreham, 1758–1751 •
William Addams Williams (1787–1861), British Member of Parliament for Monmouthshire •
William Williams (Radical politician) (1788–1865), Welsh businessman based in London, Radical MP 1835–1847 and 1850–1865 •
William Williams (Swansea MP) (1840–1904), British Member of Parliament for Swansea District 1893–1895 •
William Williams (Labour politician) (1895–1963), British civil servant and politician •
Thomas Williams (Warrington MP) (William Thomas Williams, 1915–1986), British Member of Parliament for Warrington •
William Williams (Weymouth MP) (1774–1839), British Member of Parliament for Weymouth and Melcombe Regis •
W. Llewelyn Williams (1867–1922), Welsh journalist, lawyer and Liberal Party politician
Other countries •
William Williams (New South Wales politician) (1856–1947), member of the New South Wales Legislative Assembly •
William Williams (Tasmanian politician) (1851–1924), member of the Tasmanian Legislative Council • William J. Williams, elected in the Alberta general election, 1944 under the
Veterans' and Active Force party banner ==Religion==