Joint strikes over public sector pay will be voted on by members of all registered trade unions at the end of the summer.
The programme for the annual Trades Union Congress in September includes two motions calling for co-ordinated industrial action.
Both the Public and Commercial Services Union (PCS) and the National Union of Teachers (NUT) ask delegates to support the strikes.
Unions are angry that the government has capped public sector pay rises at 2% with inflation running above 4%.
The PCS motion states: “Congress believes that the sector-wide pay freeze has created the conditions for another co-ordinated campaign including industrial action if necessary.
“Congress calls on the general council and executive committee to convene an immediate meeting of interested unions to discuss coordinated industrial action and give full support to any such action.”
The NUT meanwhile asks the general council to give full support to affiliated unions’ efforts to oppose the government’s 2% pay ceiling.
It also asks it to “co-ordinate a joint campaign of opposition at national and local levels to the government’s unfair public sector pay limit, including co-ordinated joint industrial action”.
The congress will be held in Brighton from 10 to 13 September.