Afghanistan President Hamid Karzai said: "Prime Minister Thatcher was one of the greatest leaders the world knew.”
He added that she would always be remembered in history as a strong leader who had truly served her country, particularly in strengthening the UK’s economy.
Karzai offered his condolences to the family, friends, relatives.
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Theresa May has launched her bid to become the next leader of the Conservative Party.
David Cameron's successor is likely to make the decision on whether to expand Heathrow or another London airport.
Michael Gove is to stand for the Conservative Party leadership, saying he does not believe Boris Johnson can "provide the leadership".