Nancy Share (d. 2002) was a science fiction fanzine editor and artist.
Her next zine was Ignatz, also published in the 1950s.
Nancy Share is credited with originating many catch-phrases that have been popular in science fiction fandom. She is credited with popularizing the term "Ignatz', through her zine of the same name, as well as the definition of the term "Filk Song", a singing style popular with SF enthusiasts. As well, in SF fandom the catch phrase "Bitcher Knife" is associated with Nancy Share, as in "don't provoke Nancy Share to use her Bitcher Knife on you".