MEP Martina Anderson has pledged that Sinn Fein would pursue a "put Ireland first" policy in Europe.
She made her call when she handed in her nomination papers as her party's Northern Ireland Euro candidate yesterday.
Although she is already an MEP, this will be Ms Anderson's first time to actually contest the election.
She was co-opted to her seat in June 2012 after her predecessor Bairbre de Brun stood aside for personal reasons. Sinn Fein is standing three other candidates in the Republic.
"By electing a strong team across Ireland we can take a strong voice to Europe ... our team will, if elected, provide a united and positive voice for all the citizens of Ireland," she said.
She added: "Europe delivers over 70% of our legislation and the policies pursued by the European Parliament affect us all."