This initialism can stand for:
- United Filkers of Ontario, a filk club.
- Utah Fandom Organization, a Salt Lake City group which sponsored Westercon 72 and the Utah for 2019 NASFiC bid.
- United Fanzine Organization, a group of largely comics-oriented zine publishers.
- Unidentified Flying Object, an embarrassment too often associated with fandom.
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