Scotland's largest teaching union, the EIS, is balloting college lecturers over their pay.
The ballot closes in the first week of March, and a strike could take place before Easter.
The union is unhappy about discrepancies over how much staff who do similar jobs earn at different colleges.
Colleges Scotland said it was "disappointed", saying it didn't want students to be "disadvantaged".
The strike ballot is in support of the EIS Further Education Lecturers Association's pay claim for 2015/16.
Union general secretary…