Support staff at schools in Falkirk and Clackmannanshire have voted to strike.
Members of the GMB union in almost a third of Scotland's local councils have agreed to walk out.
It's in a dispute over pay.
Workers taking strike action include cleaning, janitorial, catering and pupil support staff.
94% of GMB members voted to reject the latest COSLA'S latest offer, of a 5.5% pay rise.
GMB Scotland’s senior organiser for public services, Keir Greenaway, said: “It is no surprise that our members are prepared to strike rather than accept an offer that is less than last year despite the costs of living being even higher.
“Our members have now spoken and COSLA should listen and arrive tomorrow with a fair offer and seize what is the final opportunity to avert industrial action.
“Whether it is our members voting to strike in schools or those in parking who will take action within days, council workers are sick of being overworked and undervalued.
“It is time for political leaders to show some leadership.”
Forth Valley College staff striking
Changes to Stirling waste recycling centres
Petition against school changes
Concerns over Falkirk constituencies
79-year-old dies after Callander crash