Three Presidents and two Prime Ministers have died in a helicopter crash since 1969.
The latest is Iran President Ebrahim Raisi who died May 19.
The IRNA state news agency says that also on board were Ayatollah Mohammad Ali Al-e Hashem, the imam for Friday prayers in the city of Tabriz, and General Malek Rahmati, the governor of the Iranian province of East Azerbaijan.
The commander of the president's protection unit, Sardar Seyed Mehdi Mousavi, was also killed, as were a number of bodyguards and helicopter crew who have not yet been named.
The helicopter carrying President Raisi made a "hard landing" after it got into difficulties, state media reported.