Wingnut may refer to:
- Wingnut (hardware), a nut with a pair of wings to enable it to be turned without tools, used where frequent adjustments are needed or part removal can be made quickly at some later stage
- Pterocarya, a genus of trees bearing winged nuts
- Wingnut (politics), an American slang term for a person who holds extreme political (especially right-wing) views; compare with "moonbat"
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