The NASUWT Teachers' Union have voted overwhelmingly for industrial action following a six-month-long pay dispute.
It is the third teachers union to vote for industrial action following ASCL and the NAHT.
On the Isle of Man, 94% of NASUWT members who took part in the ballot voted in favour of strike action and 98% voted in favour of industrial action short of strike action.
The turnout was 68%.
The Union represents around 60% of teachers and school leaders members on the Isle of Man.
While any industrial action is to be regretted, the NASUWT had no other option but to take this unprecedented step of balloting its members. Since 2010, teachers and school leaders have year after year faced the erosion of their pay amounting to real-terms pay cuts of a third. The Department for Education, Sport and Culture has delayed and prevaricated over the pay award. Today’s result sends a clear message that members will not put up with delays any longer. Their patience is exhausted."