Russian and Iranian media reported last week that the Russian president would go to Iran in August for talks with Hassan Rouhani on Tehran's nuclear programme.
But Ambassador Seyed Mahmoud-Reza Sajjadi told a news conference that these reports were false, and that Putin's first talks with Rouhani would be on the sidelines of a summit of the six-nation Shanghai Cooperation Organisation in the Kyrgyz capital, Bishkek, on Sept. 13.
World powers hope Iran's relatively moderate new leader will comply with demands for Tehran to scale back nuclear work which they suspect is aimed at enabling it to make bombs.
Iran says it is enriching uranium, the fissile material for atomic bombs, only to fuel nuclear power stations and for medical purposes.
Western diplomats say the world powers will have to wait for a new government to be formed in Iran before they can discuss a date for a new round of talks.
"Clearly, let the new Iranian government settle in well. There will be a new government formed. But we are ready for talks anyway," Sajjadi said.
Sajjadi denied reports that Tehran and Moscow had been discussing the possibility of Russia providing Iran with Antey-2500 anti-ballistic missiles, to replace deliveries of S-300 missiles that were frozen by Moscow after international sanctions were placed on Iran.
But he said any proposal for such a deal by Moscow could become part of negotiations on how to settle the S-300 issue.