The Queen made her first Christmas broadcast in 1952
The Queen is expected to pay tribute to Britain's armed forces in this year's Christmas Day broadcast.
She will also urge young people of the Commonwealth to come together to discuss the environment.
Her message comes after the toll of UK servicemen killed in Afghanistan this year passed 100, and the world met at Copenhagen to discuss climate change.
It is one occasion when the Queen can voice her own views, says BBC royal correspondent Nicholas Witchell.
'No more valuable role'
The annual speech usually has a strong religious framework, reflects current issues and often draws on her own experiences and concerns.
The armed forces and the Commonwealth are known to be two areas of close interest for the 83-year-old monarch.
And the environment is an issue that has been high on the Commonwealth's agenda.
At a gathering of leaders from the institution's member states last month, the Queen urged them to take a lead in the international response to the challenge of climate change.
She will say: "It is important to keep discussing issues that concern us all - there can be no more valuable role for our family of nations."
The Queen's grandfather, King George V, delivered the first royal Christmas broadcast live on the radio from Sandringham, Norfolk, in 1932.
She made her first Christmas broadcast in 1952 and the annual message was first shown on TV in 1957.
The message is broadcast at 1500 GMT on Christmas Day and this year's speech will also be made available from the same time on the video-sharing website YouTube.
The Queen's speech will be broadcast on BBC1 at 1500 GMT on Christmas Day.
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