Ibidem was a science fiction fanzine by P. Howard Lyons and Pat Lyons.
Ibidem was published in Toronto, Ontario, Canada during the 1950s. P. Howard Lyons was a member of "The Derelicts", a group of science fiction fans associated with the fanzine Canadian Fandom.
Pat Lyons is also known as the artist Pat Patterson, whose artwork can be seen in many of the fanzines of this period of the 1950s, including A Bas, Canadian Fandom and Inside and Science Fiction Advertiser.
Issue 3 of Ibidem was distributed by the Offtrails Magazine Publishers Association. Six issues were published.
Ibidem was a Canadian Amateur Fan Publishers (CAFP) zine which, in the 1950s, also included A Bas by Boyd Raeburn, Damn! by Norman G. Browne, Deja-Vu by P. Howard Lyons, Escape by Fred Woroch, Fie by Harry Calnek, Filler by Norman G. Browne and Dean Grennell, Gasp! by Gerald Steward, and Mimi by Georgina Ellis.
Ibidem was also the title of a fanzine by P. Howard Lyons that he began publishing at the same time, but that ran for much longer, having to do with stage magic.