Other
- Duff baronets, three titles in the Baronetage of the United Kingdom
- HMS Duff, one ship of the Royal Navy and one ship that was to be transferred from the US Navy, but was not
- Plum duff, a pudding
- Duff, another name for plant litter, plant material that has fallen to the ground
- Duff House, Banff, Scotland
- Duff Beer, a fictional brand of beer on The Simpsons
- Elmyra Duff, a fictional Tiny Toon character
- The Down Under Fan Fund
- Duff, Indian frame drum
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