Ahmadinejad registered for presidential election along with his close aide, former vice-president and head of Iran Cultural Heritage, Handicrafts and Tourism Organization (ICHHTO) Hamid Baqayee.
He was also accompanied by his former chief of staff Esfandiar Rahim Mashayee.
Candidates started on Tuesday enrollment for presidential election.
The presidential candidates can enroll for presidential elections on April 11-16.
The 12th presidential election and also the 5th elections for the city and village councils as well as the parliamentary run-off for some constituencies will be held on May 19.
Incumbent President Hassan Rouhani has said he will stand for the 12th presidential election in Iran.
176 people, including several former officials, politicians and ordinary people, have also registered their names so far on Wednesday to run for the next presidential election.
In relevant remarks in March, Supreme Leader of the Islamic Revolution Ayatollah Seyed Ali Khamenei asked the entire Iranian nation to show massive turnout in the upcoming presidential election on May 19.
Addressing a large gathering of Iranian people at the sacred shrine of Imam Ali Ibn Musa al-Reza (AS) in the Eastern city of Mashhad, Ayatollah Khamenei stressed the importance of public participation in the upcoming presidential election.
"What is primarily important for this humble being is your taking part in the election. All those who can vote should participate in the election; this is our primary and most important request," he said.
Ayatollah Khamenei emphasized the importance of actions based on the law and said, "On the issue of elections, the exact requirements of the law should be acted upon. Therefore, whatever the result may be, it will be valid. It will be legal."
"I don’t interfere in the election process at all. There is only one thing I meddle in, and that is when a few individuals want to stand against popular vote and the people’s choice, intruding on the people’s vote. Anyone who seeks to confront a nation’s vote, I will stand against them. This has been the same in the previous elections. This was the same case for elections of 2001, 2005, 2009, and 2013. Sometimes, this happens right before the eyes of the people. And in other cases, this humble person was informed while the people were not. In all those elections, I've mentioned, there were people who wanted to confront the elections. It became clear only in 2009; but, in all those years I stood up. I made it clear that whatever the election results are, they should be acknowledged."
"The services the Islamic establishment and the Islamic Republic have offered, to the Iranian nation, are outstanding and are great. A simple comparison with the monarchic era shows what great and precious services the Islamic establishment has accomplished. Yes, there are weaknesses, in our management, but not among the general movement of the Islamic establishment. Wherever we had revolutionary, active, and dynamic management systems, we progressed. Wherever we had weak, desperate, non-revolutionary, non-active management systems, our tasks were either left behind or had gone astray," Ayatollah Khamenei said.
He urged the managers and authorities to be more active, and added, "Managers should be more motivated and efficient. I firmly argue that if the management from various sectors are faith based, revolutionary and efficient, all problems of Iran would be solved; we don’t have unsolvable problems."