Maritime
- HMS Defiance (disambiguation), nineteen ships of the British Royal Navy
- USS Defiance (disambiguation), three ships of the U.S. Navy
- Defiance (steamboat), a vessel in the Puget Sound Mosquito Fleet in the early 1900s
- Defiance (yacht), a participant in the 1914 America's Cup
- CSS Defiance, a ship in the Confederate River Defense Fleet during the American Civil War
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