From August 31, citizens will be able to add an "observation" to their passports stating their sex should be "identified as 'X', indicating it is unspecified," the government said in a statement.
The move will help Canadians have documents that "better reflect their gender identity," it said.
These interim measures will be in force until authorities are able to print an "X" on passports and other documents.
In June, Canada passed a law adding "gender identity and expression" alongside race, religion, age, sex and sexual orientation among prohibited grounds of discrimination under the Canadian Human Rights Act.
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