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Alongside Prime Minister David Cameron, Liberal Democrat leader Nick Clegg, opposition leader Ed Miliband and Westminster Plaid Cymru group leader Elfyn Llywd, as well as high commissioners from Commonwealth countries and leaders of the Armed Forces will attend today's service in London.
Thousands of veterans will also march through Whitehall to pay their respects at the Cenotaph.Last night Rod Stewart performed for the Queen at the Festival of Remembrance in honour of Britain's war dead.
Remembrance Sunday events will be held across the country today in tribute to members of Britain and the Commonwealth's Armed Forces who have died during conflicts.
The Queen will attend a service at the Cenotaph in Whitehall, where she will lay a wreath in memory of those who have made the ultimate sacrifice.
She will be joined by a host of senior royals, Prime Minister David Cameron and leaders of opposition parties for the service, a focal point of the nation's Remembrance Sunday ceremonies.
The first stroke of Big Ben at 11am and the firing of a gun from Horse Guards Parade by The King's Troop Royal Horse Artillery will mark the start of two minutes' silence, which will be followed by The Last Post, sounded by the Buglers of the Royal Marines.
The Queen will then lay the first wreath, followed by the Duke of Edinburgh, the Duke of Cambridge, the Duke of York, the Earl of Wessex, the Princess Royal, Prince Michael of Kent and Field Marshal Lord Guthrie of Craigiebank.
The Prince of Wales and Duchess of Cornwall are unable to attend as they are in New Zealand on a Jubilee tour.
A group of Royal Marines has marked remembrance weekend by trying to set a new world record for speed marching the length of a marathon, while carrying full kit.
Unfortunately rain slowed them down and they missed their target by just three minutes.
Mark Scoular, a police officer and ex-Royal Marine who founded Commando 999, said that the Marines would not let the bad weather hamper their marathon challenge over Remembrance weekend.
"It is wet, but we will all be cheery and absolutely fine, I'm sure. It will be a good old pace but we are all looking forward to it."
A group of Royal Marines have received a send off from the Prime Minister as they set off around London gunning for a world record as part of the Remembrance weekend.
The marines left Downing Street to embark on a marathon speed-march, carrying kit and an SA80 assault rifle which combined weigh more than 40lb (18kg).
They must get round the 26.5 mile course in less than four hours and 19 minutes to break the record, currently held by the RAF Regiment.
The charity effort hopes to raise £50,000 for the Royal Marines Association and Commando 999.
Rod Stewart and Alexandra Burke will perform for the Queen at the Festival of Remembrance tonight in honour of Britain's war dead.
The televised event, staged at the Royal Albert Hall in London, will include a performance by the Military Wives choir whose members all have partners who have served in Afghanistan.
Other royal guests at the event will include the Duke of Edinburgh, Duke of York, the Princess Royal and her husband Vice Admiral Sir Timothy Laurence, the Earl and Countess of Wessex, the Duke and Duchess of Gloucester and Prince Michael of Kent.
The Prince of Wales and Duchess of Cornwall will be absent tonight and tomorrow as they are in Australia and New Zealand on a Jubilee tour, while the Duke and Duchess of Cambridge will also not be present tonight, but are expected tomorrow.
The evening will be hosted by BBC broadcaster Huw Edwards.
Prime Minister David Cameron will kick start the remembrance weekend when he addresses a group of Royal Marines outside 10 Downing Street today.
The Conservative leader will hear a rousing rendition of Jerusalem, sung by the chart-topping Military Wives Choir before the teams of Royal Marines head off around the streets of London to break a speed march world record.
The two teams of Royal Marines will raise around £50,000 for the Royal Marines Association as they run a 26.5 mile course in under four hours and 19 minutes.
The Queen will attend the Royal British Legion Festival of Remembrance this evening.
This annual festival at the London venue commemorates and honours all those who have lost their lives in conflicts.
Labour's Shadow Defence Secretary Jim Murphy MP has said that Britain's Armed Forces play a central role in "our national character".
He said: "As we look ahead to Remembrance Sunday we should all reflect that our Armed Forces are central not just to our national security but our national character. They embody the values we seek to uphold at home and overseas.
“Theirs is a patriotism and professionalism around which we can all unite in support. Our Forces’ actions provide stability for those beyond our borders whose names and stories they do not know in the knowledge that our security at home depends on that of others overseas.
Murphy added: “Servicemen and women’s struggles, sacrifices and courage do not end when they leave the battlefield. Huge challenges exist for our veterans and we all have a duty to respect, honour and thank those who have served.
“This goes beyond just wearing a poppy. It’s about a year-round national attitude which seeks to give members of the British Armed Forces past and present and their families the care and support they deserve.”
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The Queen led the nation in observing a two-minute silence to pay tribute to fallen military servicemen and women for Remembrance Sunday.