High Commissioners from 53 member nations are also expected to take part in the celebrations.
According to The Telegraph, the Queen, in her annual Commonwealth Day message, will state the institution's 'global perspective' and its attempts to do its best "to meet people's most pressing needs."
The Queen's address will form a part of the annual Observance of Commonwealth Day at Westminster Abbey this afternoon attended by the Duke of Edinburgh and a host of dignitaries.
The Sovereign, who is head of the Commonwealth, will state in her pre-recorded message, "We can rightly celebrate the fact that the founding members' vision of the future has become a reality."
Nearly a billion people of the present Commonwealth are under 25 years of age.