Deputy Sorca Clarke will also be running to retain her seat.
Sinn Féin have selected Barry Campion as their second candidate for the upcoming election in Longford Westmeath.
Mr Campion ran in the Local Elections in Longford in June, but did not make it onto the council.
Sorca Clarke, Sinn Féin's spokesperson for education will also be running to retain her seat.
Confirming the news on Facebook, Mr Campion says he is 'striving to bring change' in the constituency.