Witches' butter (or Witch's butter) may refer to:
- Exidia nigricans, a black, gelatinous fungus
- Exidia glandulosa, a black, gelatinous fungus
- Tremella mesenterica, a yellow, gelatinous fungus
- Dacrymyces, a jelly fungus often confused with Tremella
- Nostoc, a genus of gelatinous cyanobacteria
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