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.
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.