A Bas was a science fiction fanzine published by Boyd Raeburn.
Published in Toronto, Ontario, Canada, A Bas began as the organ of "The Derelicts", as the members of The Toronto SF Society called themselves. It was originally intended as a one shot to be sent free to all subscribers of Canadian Fandom. The first issue was put together in one night - starting at 3 PM on Saturday, January 23, 1954 and ending at 5AM on Sunday - by Raeburn and friends Albert Lastovica, Howard Lyons, Ron Kidder, Gerald Steward and Kenneth G. Hall. The rest of the run of A Bas was edited by Raeburn on his own. 11 issues were released, the last issue appearing February, 1959.
Included in A Bas were little playlets called "Derelicti Derogations" created by the editor from actual overheard conversations of members of The Derelicts with fans.
Artists contributing to A Bas include Pat Patterson.
Writers contributing included Robert Bloch, Dick Ellington (Metrofan), Rich "Alex" Kirs, Lee Hoffman (Quandry), Walt Liebscher (Chanticleer), Robert Shaw, Bob Tucker (Le Zombie), Harry Warner, Jr. (Spaceways) and Walt Willis (Slant).
A Bas was distributed by the Canadian Amateur Fan Publishers.