Another councillor has left Labour, claiming the party has "lost its way".
Cian O'Callaghan, a former mayor of Fingal, said the party is implementing "unfair and unjust policies".
The now-Independent Councillor has accused the party of deserting their politics.
"Over the last period especially of the Labour Party being in government, I feel it's not pursuing broad, centre-left policies," he said.
"In my view, it's the only centre-left policy party in the world that is making cuts in areas like health and education, while at the same time not increasing taxation on high earners over €100,000."
He is the third elected member of Labour to have resigned from the party this week.
O'Callaghan also said there is an appetite for a new centre-left party.
"They're not getting that from the Irish Labour party at all, and I think there's a vacuum that needs to be filled.
"I'm hoping to work with others over the coming period to ensure that we can offer people a choice at the next elections."