If you are the complainant or respondent in a harassment investigation, then most provinces require that you be told the results of an investigation, along with whether any disciplinary measures were taken as a result. This can help bring employees peace of mind to know that their complaint was dealt with seriously and that there were consequences for any behaviour.
However, parties in an investigation are not necessarily entitled to receive the full investigation report. This report will contain additional sensitive information that may be known only to management and to the investigator, and it is not meant to be spread widely. If you have participated in an investigation, you are more likely to receive a 1-2 page letter than you will a ~100 page document.
In other investigations, participants are not entitled to know the outcome, though the “accused” will undoubtedly know the result.