This paper presents an overview of the major Canadian online systems, which account for approximately 5% of information vendors and databases worldwide. Also described is DATAPAC, Canada's national telecommunications network, and DATAPAC's X.75 interface with TELENET, TYMNET, UNINET, and France's TRANSPAC. The online systems described include: (1) CAN/OLE, the online system of the Canada Institute for Scientific and Technical Information (CISTI), Ottawa, which provides access to some 20 databases of which 9 are Canadian; (2) IDRC/MINISIS, an information retrieval system developed by the International Development Research Centre (IDRC), Ottawa, which is used as a training system because it can be searched without charge by all Canadian online search centers; (3) QL/SEARCH, the online system developed by QL Systems Ltd., Ontario, which provides access to over 60 databases with emphasis on Canadian information; (4) INFO GLOBE, the full-text online version of the Globe and Mail (Toronto), one of Canada's leading newspapers; and (5) INFORMATECH/QUESTEL, a completely French-language online system operated under the auspices of the Quebec government's Ministry of Communications. The importance of Canadian online and telecommunications sytems, both to Canadian searchers and others, is emphasized. A list of the addresses of Canadian online services and a 16-item bibliography are also provided. (Author/ESR)