May 28, 2017 1013 GMT
The processions began at the University of Tehran, central Tehran.
Ayatollah Rafsanjani will be liaid to rest in the mausoleum of late founder of the Islamic Republic Ayatollah Rouhollah Khomeini in southern Tehran today. Ayatollah Khamenei will lead the funeral prayers.
The two-time president, who served from 1989 to 1997, was taken to a hospital near his residence north of the capital after suffering a heart attack. Doctors performed CPR in vain for nearly an hour and a half before pronouncing him dead. He had been the chairman of the State Expediency Council since he left office.