William Cavendish-Bentinck
William Cavendish-Bentinck may refer to:
- Charles [William Frederick Cavendish-Bentinck], Church of England clergyman
- Lord [William Charles Augustus Cavendish-Bentinck], great-great-grandfather of Queen Elizabeth II
- Lord William Bentinck, British statesman
- William Cavendish-Bentinck, [3rd Duke of Portland], British prime minister
- William Cavendish-Bentinck, 6th Duke of Portland, Knight of the Garter
- William Cavendish-Bentinck, 7th Duke of Portland, 2nd Chancellor of the University of Nottingham
- William George Cavendish-Bentinck, British Member of Parliament for Penryn and Falmouth, 1886–1895