The former oil and telecommunications minister is the least well-known of the eight presidential candidates.
Gharazi, 71, served in parliament in the 1980s and 1990s. He is considered a conservative and a technocrat.
Gharazi was once a member of the exiled Iranian opposition group Mujahedin-e Khalq (MKO).
Gharazi reportedly left the MKO before the group left for Iraq to fight alongside Saddam Hussein in the Iraq-Iran War.