“It will show that this unipolar world is filled with justice-seeking countries, like the members of the N.A.M.,” said Ali Akbar Javanfekr, Mr. Ahmadinejad’s media adviser, in an interview on Saturday.

Iranian politicians maintain that the United States and Israel are trying to create what they call “Iranophobia,” trying to isolate its representatives during international meetings in Western capitals and portraying Iran as a rogue state.

On Friday, Israel’s prime minister, Benjamin Netanyahu, asked the United Nations secretary general, Ban Ki-moon, not to travel to Tehran for the meeting, saying it would lend legitimacy to “a regime that represents the greatest danger to world peace,” an Israeli newspaper, Haaretz, reported.

The diplomatic bonanza of the conference will help counter that effort, an influential lawmaker, Gholam Reza Mesbahi Moghaddam, told the Khabar Web site, showing that “the United States has failed in its goal of isolating the Islamic republic from the rest of the world.”

Breaking with his practice of meeting primarily with Islamic leaders, Iran’s supreme leader, Ayatollah Ali Khamenei, is set to open the meeting. He is convinced that the world is on the eve of major changes, and says the West is economically and spiritually paralyzed while “Iran is providing answers to the world’s questions,” he said Sunday.

Since the end of the cold war and the rise of non-Western powers, the Nonaligned Movement has been looking for relevance. Iranian politicians say they see many comparisons between their worldview and the principles of the movement, which stresses independence and noninterference in domestic affairs.

Yet, Mr. Khamenei’s foreign policy adviser, Ali Akbar Velajati, recently criticized the organization, saying it “needs to undergo reforms and changes in terms of its infrastructure and content.” He called for a permanent secretariat and hinted that it could be located in Tehran.