Services and ceremonies are being held across the UK to remember the servicemen and woman who sacrificed their lives for their country in armed conflicts past and present.
Many churches have planned their Remembrance Sunday services to coincide with parades of local servicemen and women and flypasts by military aircraft.
Troops deployed in Afghanistan and Iraq will also join in services.
Colonel Paul Eaton, a Christian in the Army who last week helped launch a new Armed Forces prayer line with UCB, urged the nation to remember the men and women deployed in conflict zones around the world today.
"There are ordinary men and women out there on the frontline and regardless of the politics of it all, they are there effectively to defend our nation and are undergoing tremendous pressure and stress and some of them are paying with their lives or serious injuries," he said.
"In the past Remembrance Day was about the tremendous sacrifice that people gave in the past, but now it is also about the sacrifice that is being given today," he said.
In London, the Queen will lay a wreath at the Cenotaph and join in the two-minute silence to mark 90 years since the ceasefire to end World War I. Three veterans of the supposed "war to end all wars", all over the age of 100, will also attend the tributes at the Cenotaph in the presence of thousands of other veterans.
Prime Minister Gordon Brown, Foreign Secretary David Miliband and leaders of the opposition will also lay wreathes, whilst the Prince of Wales will take part in the Welsh Guard's service of Remembrance at the Guard's Chapel in central London. Prince Charles is a colonel in the Welsh Guards.
