The vote was brought forward to September 15 after the nation’s president, Beji Caid Essebsi, died last week at the age of 92. He assumed office in 2014 and ruled out seeking reelection.
Among the presidential hopefuls are media mogul Nabil Karoui, Mohamed Abbou of the centrist Democratic Current party and Abir Moussi of the right-wing Free Destourian Party, the TAP news agency said.
Prime Minister Youssef Chahed is also expected to run, as is Defense Minister Abdelkarim Zbidi. They have not officially registered yet.
The registration period ends on 9 August. The final list of presidential contenders will be published on August 31. Preliminary voting results are expected to be announced on 17 September.