MP Tulip Siddiq, who also attended, said the Anglo-Iranian dual “deserves to hear directly” from Boris Johnson why it took so long to bring her home.
A spokesman for the Prime Minister said: “We have previously said that the Prime Minister is ready to meet both Nazanin as well as he (Anoosheh) Ashoori.
“That’s what we’ve been trying to sort out. I had planned that he would welcome her to Downing Street to discuss her ordeal in Iran. ”
The official said engagement was “something we worked together to happen”.
The meeting will be the first time the two have faced each other after Mr Johnson, then foreign secretary, falsely claimed in 2017 that Ms Zaghari-Ratlcliffe had trained journalists at the time of her arrest in 2016.
Four days later, she was summoned before an unscheduled trial, where his comments were cited as evidence that she had engaged in “propaganda against the regime”. A Foreign Office spokesman said Mr Johnson accepted that he “should have been clearer”.
Asked if Mr Johnson had apologized to Ms Zaghari-Ratcliffe, the spokesman replied: “I think it’s important to remember that the Iranian government is responsible for her unfair detention, and The decision to free her has always been their gift. .
“However, I would like to go back to the Prime Minister’s words, his answers to questions on this matter before and he previously apologized for his comments in 2017.”
Ms Zaghari-Ratcliffe was freed in March along with fellow inmate Anoosheh Ashoori after the UK agreed to settle a historic £400m debt that dates back to the 1970s.
“I am delighted to be invited to join Number 10 with member Nazanin Zaghari-Ratcliffe and her family. I know my 7-year-old daughter, Gabriella, is especially delighted to meet the Prime Minister,” said Ms Siddiq, MP for Ms. Zaghari-Ratcliffe’s constituency.
“After six long years of unprovoked and illegal detention in Iran, Nazanin deserves to hear in person from the Prime Minister why it took so long to bring her home.”
The MP said further detention of other British nationals, including Morad Tahbaz, would also be introduced at the meeting.
“(The Prime Minister) has a responsibility to make sure that others don’t have to endure the six years of suffering that Nazanin went through,” she said.
“I will also submit evidence to the Foreign Affairs Committee’s investigation into the hostage taking, which I hope will uncover the bottom of the Government’s grisly failure to handle cases like these. by Nazanin.
“Never again should the Government have to allow British nationals to be held hostage with so little to do to secure their release and so little retaliation against those responsible.”
It comes after an announcement last month that MPs would open an investigation into the detention and release of Ms Zaghari-Ratcliffe and Mr Ashoori from Iran.
The Commons Foreign Affairs Committee said it would take evidence into how British officials handled their case as part of a broader investigation into a “state-level hostage situation”.
After their return, both criticized the failure of the Foreign Office (FCDO) to secure their freedom sooner.
Announcing the investigation, committee chairman Tom Tugendhat MP said their return was “long overdue” and that they had the right to seek answers about what happened.