SIPTU has said the task of restoring public service pay must begin during pay talks scheduled to take place this week.
Ireland's largest union said unions will be also be seeking the abolition of the pension levy and commitments against privatisation.
Labour ministers have not ruled out linking any increases to enhanced productivity.
Public service unions have already outlined want they want.
The demands were reiterated by SIPTU president Jack O'Connor at a Labour Party commemoration of James Connolly in Arbour Hill.
The Department of Public Expenditure will be meeting public service union representatives and said they hope to have agreements in place before the summer recess.
Meanwhile, Renua Ireland has said that singling out public servants for pay restoration is not what the economy needs at this time.
The party is opposed to pay agreements occurring behind closed doors.
Separately, People before Profit has said that low income public and private workers should get an increase.
Elsewhere, Tánaiste and Labour leader Joan Burton dismissed reports that the Taoiseach is being pressured by his party to call the general election early.
She said she has discussed the matter with him and they agreed that the Government will run its course.