Naim Kassim also has been re-elected as Mr. Nasrallah's deputy, according to the statement.
Hezbollah's leadership elections are usually held every three years but they were last held in 2004. A Hezbollah official said the two-year delay was caused by internal Lebanese differences and the 2006 Hezbollah-Israel war. The official spoke on condition of anonymity because he isn't authorized to speak to the media.
Founded in 1982, Hezbollah gained notoriety in the West when it was linked to the kidnapping of Western hostages and a series of bombings against Western targets.
Hezbollah has over the years grown to run a network of interests -- clinics, schools, a TV station and a weekly newspaper. It caters mainly to Lebanon's 1.2 million Shiite Muslims, the country's largest single sect.