Dympna Cunniffe will run with current TD's Joe Flaherty and Robert Troy.
Fianna Fail have named a third candidate to run in the forthcoming general election in the Longford/Westmeath constituency.
Dympna Cunniffe is set to run with current TDs Robert Troy and Joe Flaherty.
The Mount Temple woman is being described as an "avid fundraiser and hard worker".
Ms Cunniffe is set to make her debut in electoral politics.