The two other teachers are morning shift in-charge Zinat Akhtar and class teacher Hasna Hena.
The institution’s governing body took the decision to fire them after an emergency meeting following government orders on Wednesday.
Dilip Adhikary, the father of the dead ninth grader Aritry Adhikary, had already started a case against the three accusing them of instigating the girl to take her own life.
Earlier in the day, the government cancelled the facilities the trio had been enjoying under its monthly pay order or MPO programme.
The education ministry has also asked police and Rapid Action Battalion to act against them following the case started by Dilip.
“We did exactly what the education ministry asked us to do,” Mushtari Sultana, a teacher representative in the governing body, told bdnews24.com after the meeting.
The institution has also deferred Wednesday’s annual exams to Dec 11.
Thursday’s exams will be held on Friday, according to Mushtari.