A Bas was a science fiction fanzine published by Boyd Raeburn.
Published in Toronto, Ontario, Canada A Bas began as the publication of the "Derelicts" The Toronto SF Society) . 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.
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.