At present, if you voluntarily acquire a foreign nationality, you will no longer renounce your Belgian nationality. For further information refer to the section Losing Belgian nationality.
If you are a Belgian citizen and you automatically receive another nationality (= without having taken any steps to do so, e.g., at birth because one or both of your parents have a different nationality), you will not lose your Belgian nationality because of this and can therefore have two or more nationalities.
If you hold another nationality and obtain Belgian nationality, the Belgian authorities will not ask you to renounce your original nationality. It is nevertheless advisable that you consult your national authorities to find out whether the acquisition of Belgian nationality would result in the loss of your original nationality, according to the legislation in force in your country.
You will always be considered a Belgian citizen by the Belgian authorities.
Question on Canadian nationality
The Consulate General in Montreal is not competent in matters of Canadian nationality. For all questions concerning the acquisition of Canadian nationality, please contact the appropriate Canadian authorities.