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
This page is an index of articles on fungus species (or higher taxonomic groups) with the same common name (vernacular name). If an internal link led you here, you may wish to edit the linking article so that it links directly to the intended article.