UN's electoral chief Carina Perelli was fired over sexual harassment and authority abuse charges on Tuesday.
UN Undersecretary-General Christopher Burnham handed 48-year-old Perelli a letter of dismissal in the morning.
According to the letter she was dismissed due to "serious misconduct" and conduct "inconsistent with the standards of conduct expected of international civil servants."
An internal investigation had shown that Perelli had been "engaged in sexual and professional harassment" of her staff and that she had abused her authority as a manager.
Perelli said that she would appeal the dismissal, because the accusations were wrongful.