Circuit Court judge Gerard O'Brien has resigned from his position.
The 59-year-old from Thurles in Co Tipperary was convicted last month of the sexual assault of six young men, some of whom were students at the school where he was a teacher.
He was in his 30s at the time, while the six complainants were aged between 17 and 24.
O’Brien is due to be sentenced on 4 March.
In a statement, Justice Minister Helen McEntee said the resignation has been forwarded to the President "in accordance with the requirements of section 6 (2) of the Courts (Establishment and Constitution) Act 1961".
