According to what the Italian oil company "Eni" announced, Iran occupies the third place among the 10 countries that have the largest oil reserves in the world.
According to Shafaq News, based on this chart, Iran's oil reserves reached 208.6 billion barrels of oil in 2022.
Eni added that:
With 303 billion 375 million barrels of oil, Venezuela is still the largest holder of oil reserves in the world, followed by
Saudi Arabia with 272 billion and 904 million barrels
Iran in 2022 at 208 billion and 600 million barrels
Canada with 161 billion and 678 million barrels of oil and
Iraq with 145 billion and 19 million barrels of oil
     They rank first to fifth in the world in terms of oil reserves.