All Mimsy was a fantasy fanzine published by Eleanor Arnason, Ruth Berman and Ron Whyte.
All Mimsy was published in Minneapolis, Minnesota, U.S.A. in the 1950s. The three editors published the fanzine under the pseudonym of "George Karg". The title was derived from the Lewis Carroll poem Jabberwock.
Issue 3 was published in 1958, and issues 4,5, and 6 in 1959. One issue edited by Ruth Berman on her own appeared in 1960.
Issue five appeared in Movember 1959, and included the poem "The Passing of the Elven-kind", a lamenting for the elves who left Middle-earth by Ted Johnstone (Shangri L'Affaires). It is reported by Sumner Gary Hennewell in Tolkien Fandom Review to be the first writing published on JRR Tolkien's work in a fanzine. It was later reprinted in Entmoot #4.
Ruth Berman went on to publish numerous fanzines throughout the 1960s, including Dinky Bird, Nous, No, and Pantopon, and in the late 1960s, the media science fiction fanzines Despatch and Inside Star Trek, followed by T-Negative, and The Star Trek Songbook. During the 1960s and 1970s, she was also publishing the Sherlock Holmes fanzine SH - sf Fanthology.