William Howell may refer to:
Law and politics William Thompson Howell (1810–1870), American jurist and politician William Tudor Howell (1862–1911), British politician, MP for Denbigh Boroughs William Barberie Howell (1865–1927), American judge for the U.S. Customs Court William J. Howell (born 1943), American politician William G. Howell (born 1971), American political scientist
Sports William Howell (rugby union) (born 1863), Welsh rugby union player William Howell (Barbadian cricketer) (1866-1958), Barbadian cricketer William Howell (cricketer, born 1883) (1883–1960), New Zealand cricketer William Howell (cricketer, born 1902) (1902–1987), Australian cricketer
Others William D. Howell (1797–1836), American surgeon who died as a defender of the Alamo William Roe Howell (1846–1890), American photographer William Henry Howell (1860–1945), American physiologist William Devin Howell (born 1970), American serial killer William R. Howell, American businessman
See also Bill Howell (disambiguation) William Howells (disambiguation)