Later, Amir will meet with President Ibrahim Raisi.
The official visit came as EU coordinators are still in Iran to revive the nuclear deal.
Washington has been holding talks in Vienna for months on Iran’s demand to lift the so-called terrorism ban on Iran’s powerful paramilitary Revolutionary Guards.
Enrique Mora met with Iran’s nuclear negotiator on Wednesday to give a diplomatic push, detaining two unidentified European nationals after Iran announced its intelligence services. Talks continued on Thursday, Iranian media reported without elaborating.
In February, Qatar hosted Iranian President Ibrahim Raisi. Despite its small size, the small Gulf Arab Sheikadum plays a strategic role as a quiet mediator and negotiator in a region of communal and political conflict. Qatar’s relations with Washington and Tehran allow Doha to relay views between the two.