The vote comes amid a backlash against rising immigration and a severe housing shortage in Ireland.
Record voting is underway in Ireland's European Parliament elections with far-right candidates running.
14 MEPs will be elected to the European Parliament following an election campaign dominated by controversy over rising refugee numbers and a severe shortage of affordable housing.
Public concern over the presence of Ukrainian refugees and other refugees in shelters and tents in Dublin prompted the coalition government to introduce tough anti-immigration measures, including reducing social assistance for migrants and removing camps.
Around 3.6 million people in Ireland are registered to vote in the European elections.
Polling is also taking place nationally in Ireland, with polling stations open for local elections and the Limerick mayoralty.
The vote in Ireland follows the Netherlands, which opened polling stations on Thursday.
The final EU-wide results will be announced in Brussels after polling stations close on Sunday evening.
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