Iran is scheduled to play in Inglewood, California, against New Zealand on June 15 and Belgium on June 21, before finishing group play against Egypt in Seattle on June 26.
The US is hosting the tournament with Canada and Mexico from June 11 to July 19, and Iranian officials suggested recently their country's participation is in some doubt because of the war.
However, FIFA boss Gianni Infantino said he met with President Donald Trump on Tuesday night (Wednesday AEDT) "to discuss the status of preparations" for the tournament, and received assurances that Iran would be permitted to come to the US.
"We also spoke about the current situation in Iran, and the fact that the Iranian team has qualified to participate in the FIFA World Cup 2026," Infantino said.
"During the discussions, President Trump reiterated that the Iranian team is, of course, welcome to compete in the tournament in the United States."
Infantino has a close relationship with Trump, who was given FIFA's inaugural peace prize - an award many believe soccer's governing body created with the US President in mind.
Fans from Iran were already banned from entering the US in the first iteration of the travel ban announced by the Trump administration.
"We all need an event like the FIFA World Cup to bring people together now more than ever," Infantino said, adding that he thanks Trump "for his support".
Earlier this week, FIFA's World Cup chief operating officer Heimo Schirgi said the tournament was "too big" to be postponed because of global turmoil caused by the US and Israeli war against Iran.
He said FIFA continues to closely monitor the Iran war.
"We basically take it day by day, and at some stage we will have a resolution," Schirgi said.
"And the World Cup will go on obviously, right? The World Cup is too big and we hope that everyone can participate that has qualified."
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