The following classes of employment categories many not require work permits to work in Canada, however you still have to check if you require a temporary resident visa depending on your country.

• Accident or incident investigators – if you are coming to Canada to work on an aviation accident or incident investigation being conducted under the authority of the Transportation Accident Investigation and Safety Board Ac you will not require a work permit
• Athletes and coaches
• Business visitors- If you are coming to Canada to engage in international business activities without directly entering the Canadian labour market, then you will not require a work permit
• Civil aviation inspectors
• Clergy
• Crew members – If you are a flight attendant or a member of a ships' crew you do not need a work permit, so long as the vehicle you are working on is for the international transportation
• Emergency service providers – if you are coming to Canada to help out in an emergency (natural disasters, industrial accidents threatening the environment etc), you will not require a work permit.
• Examiners and evaluators
• Expert witnesses or investigators
• Foreign Government officers – If you are coming to Canada to work under the governments exchange agreement for less than three months, you will not require a work permit, otherwise you will require a formal letter of agreement.
• Foreign representatives – If you are a diplomat or an official representative of a country or the united nations, you will not require a work permit to work in Canada. Family members of this class of workers do not require a work permit. They will instead require a written authorization from an embassy or high commission.
• Health care students – if you intend to do your practicum in Canada you must have written approval from the Canadian regulatory board responsible for your occupation. However you are required to pass a medical examination and your practicum should not exceed 4 months.
• International meetings and convention organizers
• Judges and referees
• Military personnel – if you are a member of an armed force from another country and you are entering Canada under the Visiting Forces Act, you do not require a work permit.
• News reporters – If you will be working for a foreign newspaper of television channel or agency and will be reporting on events here in Canada, you will not require a work permit.
• Performing artists – if you will be performing in Canada for a limited period of time, you and your entourage (essential support staff) will not require a work permit. However if you will perform in bars and restaurants or for television or any other media, you will have to obtain a work permit.
• Public Speakers – If you will be delivering training or speaking in Canada at an event that is five days and less, you will not require a work permit
• Students working on Campus – You might not require a work permit to work on the campus of your institution.