The speaker of Tunisia’s parliament, Mohamed Ennaceur, will be sworn in as interim President on Thursday.
President Beji Caid Essebsi died earlier on Thursday in hospital.
He was 92 years old.
The prime minister also declared seven days of mourning.
The news that the world’s oldest president, Tunisia’s Beji Caid Essebsi, has died, ruled the air waves early Thursday.
In June, it was announced that he was in hospital with a severe health crisis.
In April, he announced that he was not going to stand for re-election on 17 November despite calls for him to run.
He won the country’s first free presidential poll in 2014.
He was the interim prime minister after the 2011 uprising.
Before assuming the presidency in 2014, Mr Essebsi had served on-off in ministerial roles since the 1960s, including as the interior minister and speaker of parliament. BBC