Other heads of the Commonwealth countries, including British Prime Minister Theresa May, Bangladeshi Prime Minister Sheikh Hasina, Pakistani Prime Minister Shahid Khaqan Abbasi, Canadian Prime Minister Justin Trudeau arrived as well.
Two-day Commonwealth Summit was formally opened by Queen Elizabeth at 10 a.m. (local time) on Thursday, which was followed by an official welcome of the leaders of 53 Commonwealth nations by May and Commonwealth Secretary-General Patricia Scotland.
The Queen has been head of the Commonwealth since coming to the throne in 1952, but the position is not automatically held by the British monarch.
As the Queen no longer goes abroad, the current summit in London in all likelihood will be her last.
Who replaces Queen Elizabeth II as head of the Commonwealth will be discussed on Friday.