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.
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.
A Bas was distributed by the Canadian Amateur Fan Publishers.