Frederick Cavendish may refer to:
- Charles William Frederick Cavendish-Bentinck (1817-1865), English clergyman of the Church of England.
- Lord Frederick Cavendish (1836–1882), English Liberal politician
- Lord Frederick Cavendish (British Army officer) (1729–1803), British field marshal and Whig politician
- Frederick Cavendish Ponsonby, British military officer
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