Schools are "likely to experience significant disruption" as Education Authority employees who are members of the Unite union begin seven days of strike action.
The industrial action, starting on Thursday, is a result of an ongoing dispute over pay and work conditions.
When balloted, 94% of Unite members voted to take to the picket lines.
More than 700 education workers are expected to take part in the walk out, including school bus drivers, maintenance workers, catering staff, classroom assistants, playground supervisors, school administrative staff, cleaners, building supervisors and ground maintenance staff.
Unite said the strike is the result of a "failure of the Department of Education to implement a pay and grading review".
It added that the review would see "significant increases to the pay of Education Authority workers" but said the implemented has been "prevented as a result of the punitive budget set for the department by the Secretary of State for Northern Ireland".
