U.S. citizens entering Canada required a valid U.S. passport. A visa is not required for U.S. citizens to visit Canada for up to 180 days. Anyone seeking to enter Canada for any purpose besides a visit (e.g. to work, study or immigrate) must qualify for the appropriate entry status, and should contact the Canadian Embassy or nearest consulate. US BUSINESS TRAVELLERS Persons travelling to Canada on business should provide, as appropriate to their circumstances, either a letter from their employer identifying the activities they will perform in Canada and the duration of their visit or a letter of invitation from a Canadian business outlining the reasons for the visit.