HOW TO FIND OUT IF THERE IS A FILE ON YOU, SOMEONE ELSE, OR SOME OTHER THING
1. If you think there is a file on you then it is necessary to submit a Personal Information Request Form under the Privacy Act to the Canadian government agency that you believe holds the information. InfoSource, a government publication available from most libraries, contains addresses for federal agencies.   The application is free (except for the cost of postage) and you should receive notification rather quickly indicating whether or not a file exists.

Download a Personal Information Request Form. The form is also available at most post offices and libraries.
2. You can also apply for government information about other individuals or organizations.  In the case of individuals they must be deceased for at least 20 years before an application may be made. You may be required to provide proof of this should you make an application. In the case of organization no similar requirement exists.  Whether for an organization or another individual an Access to Information form needs to be filled out and sent to the appropriate federal government agency (see how to find appropriate addresses above).  With a request under Access to Information a $5 cdn payment must also be made to the Registrar-General of Canada.  This payment is not refundable regardless of whether a file exists or not.  Again, you should be notified reasonably quickly as to the result of your request, in particular if no file exists. 

Dowload an Access to Information request form. The form is also available at most post offices and libraries.