American •
William J. Howard (1799–1862), Pittsburgh mayor in 1845 •
William Alanson Howard (1813–1880), U.S. representative from Michigan (1855–1859) and governor of Dakota Territory 1878–1880 •
William Howard (congressman) (1817–1891), U.S. representative from Ohio •
William M. Howard (1857–1932), U.S. representative from Georgia •
William O. Howard (1923-2006), American politician from Missouri •
William S. Howard (1875–1953), U.S. representative from Georgia •
William Lorenzo Howard (1921–2004), mayor of Monroe, Louisiana
British •
William Howard (judge) (before 1230—1308), English nobleman and ancestor of aristocratic Howard family, Judge Advocate of Fleet •
William Howard, 1st Baron Howard of Effingham (c. 1510–1573), English nobleman •
William Howard (died 1600) (1538–1600), English member of parliament •
Lord William Howard (1563–1640), nicknamed "Belted Will" or "Bauld Willie", third son of 4th Duke of Norfolk •
William Howard, 3rd Baron Howard of Effingham (1577–1615), his grandson, heir to 1st Earl of Nottingham •
William Howard (died 1672) (c. 1599–1672), English gentleman and member of parliament •
William Howard, 1st Viscount Stafford (1614–1680) •
William Howard, 3rd Baron Howard of Escrick (1626–1694), conspirator in Rye House Plot •
William Howard (died 1701) (c. 1674–1701), English member of parliament for Carlisle 1695–1701 and Northumberland 1701 •
William Howard (Irish politician) (before 1680–1728), member of parliament for
Dublin City 1727–28 •
William Howard, Viscount Andover (1714–1756), British member of parliament and heir to Earl of Berkshire •
William Howard, 3rd Earl of Wicklow (1761–1818), British nobleman, Earl of Wicklow •
William Howard (1781–1843), British member of parliament for Morpeth 1806–1826 and 1830–1832, Sutherland 1837–1840 •
William Howard, 4th Earl of Wicklow (1788–1869), British nobleman •
William Howard, 8th Earl of Wicklow (1902–1978), British nobleman •
William George Howard, 8th Earl of Carlisle (1808–1889), English clergyman and peer ==Performers==