As a Canadian citizen, you can travel to Ireland for short-term visits of 90 days or less without a visa or pre-clearance. However, if you plan to take part in certain activities during your trip you may need to obtain additional permissions. For example, foreign nationals who plan to work in Ireland may still require a work permit or work visa.
You can check the Irish Immigration Service Delivery website to see if you are required to obtain a pre-clearance or visa to travel to Ireland. Canadian citizens can travel to Ireland for up to 90 days without pre-clearance, electronic travel authorization, or a visa requirement.
If you had become a Canadian permanent resident after 2002, you may be eligible to travel to Ireland for short-term visits without a visa under the TWOV program. If you have the intention of staying in Ireland for longer than a 90-day period, you must apply for pre-clearance prior to travel.