William Dennison
William Dennison or Denison may refer to:
- William Dennison, 18th-century master of University College, Oxford
- William Dennison Jr., American politician, governor of Ohio and U.S. Postmaster General
- William Dennison , mayor of Toronto, Member of Provincial Parliament
- William Neil Dennison, American Civil War artillery officer
- William Denison, British colonial official, governor of New South Wales, 1855–1861, and governor of Madras, 1861–1866
- William Denison, 1st Earl of Londesborough, British peer and Liberal politician
- William Denison , English cricketer and cricket official
- William Clark Denison, American mycologist
- William Evelyn Denison, British member of parliament for Nottingham, 1874–1880
- William Kendall Denison, American classicist, and educator
- William S. Denison, Baptist farmer; benefactor and namesake of Denison University in Ohio
- William Joseph Denison, English banker and politician
- William Beckett-Denison, English banker and Conservative politician
- Doug Dennison, American football player