Visit the NCLEX Testing Locations page to see the full range of testing centres. There are both permanent and temporary testing centres where you can write the NCLEX-RN, including several locations in Ontario.
If you are outside Ontario, you can also write the NCLEX-RN in a testing location in another province or territory.
If you are outside Canada, Pearson Professional Assessments has testing centres in a number of other countries. Visit the NCLEX Testing Locations page for an updated list of locations. There may be additional fees for using international testing centres.