Tyrann was a science fiction fanzine by Norbert "Bert" Hirschhorn, published in New York, New York, U.S.A.
At least four issues of this hektographed fanzine appeared in the 1950s. The first three issues were edited by Hirschhorn with Henry Ebel. The Assistant Editor was Richard Bergeron, who later went on to publish his own fanzine, Warhoon.
Art work is by Richard Bergeron and Max Keasler.
Included in the fanzine are an editorial by Hirschhorn, articles, fiction, poetry, fanzine reviews, and a letters column.
Bert Hirschhorn also wrote a column for Spaceship.
Tyrann was a member of "Fanvariety Enterprises", an affiliation of fan publishers put together by Max Keasler and Bill Venable. It included such publications as Max Keasler's Opus, Bill Venable's Pendulum, Norman Browne's Vanations, Harlan Ellison's Science Fantasy Bulletin, Dave English's Fantasias, Bob Farnham and Nan Gerding's The Chigger Patch of Fandom, Ian MacAuley's ASFO, and Starlanes by Nan Gerding and Orma McCormick.