Fianna Fáil’s support has fallen to 15 percent, its lowest level since the last general election.
The party is the biggest loser in the latest Red C poll for the Business Post.
Fianna Fáil is down three points this month, while Fine Gael edges up to 18 percent, leaving the coalition on a combined record low of 33 percent.
Sinn Féin leads the poll on 24 percent, the Social Democrats rise to a record 10 percent, while independents slip back to 13 percent.
Labour is on 5 percent, Aontú also on 5, Independent Ireland on 4, with the Greens down to 2 percent.