A national strike will be held by civil servants and other public sector workers on 10 May, followed by another at the end of June over pensions, the PCS union said today.
The union's Mark Serwotka said: "The ongoing programme of industrial action with other unions we have agreed sends a clear message to government ministers that we do not accept their unnecessary plans to force public servants to pay more and work longer for less in retirement.
"The government must talk to us with the genuine aim of reaching a settlement but if it refuses, we will press ahead with strikes and protests the length and breadth of the country in the coming weeks and months. And we will continue to show that there is an alternative to this government's cruel and unfair cuts that clearly are not working."
It came as it was announced that thousands of NHS workers will take industrial action and other forms of protest next month in the continuing bitter row over pensions.
Unite said its 100,000 health service members will walk out on May 10, a day after the Queen's Speech, which is expected to include a Parliamentary Bill on the government's controversial reforms.
Other workers are expected to join the strike and there could be further industrial action in June.
Unite said its NHS members, including health visitors, pharmacists and paramedics, face paying an average of £30 a month more for their pensions.
The dispute has been raging for well over a year and sparked a strike by more than 1.5 million public sector workers last November.