The anniversary of the World War One armistice – signed 95 years ago on Monday – is to be marked in the UK with a two-minute silence at 11:00 GMT.
Ceremonies will take place at military bases, town halls, churches, schools, and at the National Memorial Arboretum in Alrewas, Staffordshire.
The Royal British Legion has its own event in London’ s Trafalgar Square.
Meanwhile, the Duke of Edinburgh will visit Belgium, scene of some of World War One’s deadliest battles.
This year, Armistice Day, which honours members of the armed forces who have died since the war, comes a day after Remembrance Sunday.
On Sunday, two-minute silences took place at war memorials across the UK and the Commonwealth.
In London, the Queen and other members of the Royal Family laid the first wreaths at the Cenotaph in Whitehall, before a march-past by 10,000 military veterans and civilian representatives.
On Armistice Day, the country will again be asked to pause in memory of those who have served and died for Britain.
The silence takes place at the 11th hour of the 11th day of the 11th month – the time the guns fell silent along the Western Front in 1918, and an armistice was declared.
It was first observed in November 1919 following a suggestion by an Australian journalist.
The proposal was supported by a former high commissioner to South Africa and endorsed by the cabinet and King George V just a few days before the first anniversary of the armistice.
Prince Philip’s visit to Ypres – where he will take part in a Last Post ceremony – is his first outside the UK since undergoing abdominal surgery in June.
The bugle call in the ceremony – which has taken place at the Menin Gate memorial in Ypres every day since it was founded in 1928 – will be followed by a minute’s silence.
The gate features the names of more than 54,000 British and Commonwealth soldiers who died during World War One who have no known graves.
Prince Philip, 92, will accept 70 sandbags filled with soil collected from the World War One battlefields of Flanders by Belgian schoolchildren.
The soil, taken from Commonwealth cemeteries, will be placed in the Flanders Field Memorial Garden at The Guards Museum in London, which is due to open next year.
The duke will also lay poppy wreaths to commemorate the dead.
Commemorations in Ypres began on Monday morning with a separate memorial service at Menin Gate.
In Lytham St Annes, Lancashire, people from across the UK are expected to answer a request to attend the funeral of a World War Two veteran they never knew.
Harold Jellicoe Percival served as ground crew on the famous Dambusters raids carried out in May 1943 by 617 Squadron.
The funeral home organising the service put an advert in a local newspaper – which was then widely publicised on social media sites – appealing for people to attend.
Meanwhile, 93-year-old Dorothy Ellis – thought to be the last surviving widow of a World War One veteran – is expected to join senior representatives of the government and the armed forces at the National Memorial Arboretum, in Staffordshire.
The arboretum’s Portland stone memorial is designed so that on the 11th hour of the 11th day of the 11th month, a shaft of sunlight dissects its inner and outer walls, falling on a bronze wreath sculpture.
It is the nation’s tribute to more than 16,000 servicemen and women who have died on duty, or as a result of terrorism, since 1948.
In London, the Royal British Legion’s sixth Silence in the Square remembrance will end with members of the public dropping poppy petals into the Trafalgar Square fountains.
Actor Adrian Lester and Britain’s Got Talent winner Paul Potts will make appearances at the event alongside The Poppy Girls – five schoolgirls aged between 10 and 17 whose fathers are all servicemen.
Their song The Call (No Need To Say Goodbye) was released on Saturday as part of this year’s Royal British Legion appeal.
See on www.bbc.co.uk