Leaders from the main political parties took a break from the election campaign trail to join a crowd of thousands for the occasion on Whitehall in the heart of the capital.
Buglers of the Royal Marines will sound the Last Post before wreaths are laid at the Cenotaph by members of the royal family, politicians, foreign representatives and senior armed forces personnel.
The Cenotaph Remembrance Sunday is commemorating the United Kingdom fallen heroes of war.
A host of military and foreign representatives also laid wreaths by the Cenotaph, while other Cabinet ministers and religious leaders were in attendance.
The mother-of-two wore her blonde hair in a half-up, half down style and was joined by the Duke and Duchess of Cambridge, the Queen, the Duke and Duchess of Sussex and Prince Charles and the Duchess of Cornwall.
The Queen watched from a balcony as a two minute silence was observed at 11am with the beginning and end marked by the firing of a gun by the King's Troop Royal Horse Artillery.
Kimberley Durrant, the director of the governments London office, took part in the National Service of Remembrance at the Cenotaph in the United Kingdom capital.
- Remembrance Sunday is an annual commemoration held on the closest Sunday to Armistice Day, November 11, the anniversary of the end of the First World War and services across Commonwealth countries remember servicemen and women who have fallen in the line of duty since WWI.
Former prime ministers including Tony Blair, Gordon Brown, David Cameron and Theresa May also attended.
This year marks the 75th anniversary of D-Day, the Battle of Kohima in India, the Battle of Arnhem in the Netherlands, and the Bottle of Monte Cassino in Italy.
John Rankin, the Governor, said: Bermudians fought with Allied Forces in both World Wars and we rightly honour their contribution each year on Remembrance Day in Bermuda.
"And we stand together to say: Never again".