While the electorate will pick 290 lawmakers on February 26 they will the same day select 88 members for the Assembly, a powerful committee of clerics that monitors the supreme leader's work.
The Assembly has the power to dismiss Khamenei, who is 76 and has led the Islamic republic since 1989, but its more likely and most crucial role will be in picking his successor.
In a speech to thousands in Tehran, Khamenei alluded to his death when drawing attention to the importance of polling day.
The Assembly of Experts is Iran's highest clerical body. Its members, like would-be lawmakers, are heavily screened before the ballot, and Khamenei signalled their significant role.
"That day, when the current leader is not in this world, this committee should choose a leader who holds the key to the movement of this revolution," he said.
"Depending on the composition of the assembly they may choose a leader that stands up to the enemy's attacks, trust in God and continue the path of Imam (Khomeini)," Khamenei said, referring to the founder of the Islamic republic, Ayatollah Ruhollah Khomeini.
The comments underscored tension between Iran's competing political blocs over the elections and the future direction of the country.
The Islamic republic, formed in 1979, has swayed between conservatives and more moderate and reform-minded politicians since president Mohammad Khatami was elected in 1997.
During his tenure Khatami, a reformist, and his supporters were backed by the electorate's voting-in of a supportive parliament but many of his planned changes were blocked by the Guardian Council, a conservative-led committee that can veto legislation.
Hassan Rouhani, Iran's current president, is a moderate and his allies are looking to make gains that could overturn the balance of power in a currently conservative-dominated parliament, potentially leading to social and political reforms he promised before being elected in 2013.
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