The Public and Commercial Services union (PCS) will begin a three-month programme of industrial action, including strikes, on 20 March, when George Osborne announces his budget.
The strikes are against a variety of measures, including attacks on pay, job losses, and pension reforms.
The programme will include both national and sector-specific action, and will combine strikes with other industrial action. In between days of industrial action, the union will organise local protests and campaigning activity around specific themes.
PCS general secretary Mark Serwotka said: “This is not a one-day