A new amendment to a law passed by Iranian president Mahmoud Ahmadinejad has banned "Zionist companies" Intel and IBM from Iran.
The Jerusalem Post reports that Coca Cola has also been banned from the country.
The amendment, signed by Ahmadinejad, also forbids Iranian media organisations from advertising the companies' products.
The companies join a long line of supposedly "Jewish-owned" American companies that have been black-listed by the government as part of their protest against US and United Nations sanctions against Iran.
The amendment is part of Iran's "Palestinian support law", created as a response to suggestions that Israel prevented supplies reaching Gaza during its recent raid on the aid flotilla. It is suspected that the amendment is designed to garner more support for the Palestinians against Israel from the Iranian populace.
According to the amendment, the Iranian Foreign Ministry will have to present annual reports on the progress made by boycotting the companies.