Revellers across the UK are due to welcome in the new year, bidding a fond farewell to 2012.
Large crowds are expected in London and Edinburgh and there will be many other celebrations around the country.
The fireworks display organised by London Mayor Boris Johnson is one of the highlights of the year in the English capital, with large crowds gathering in viewing areas along the Thames. A display of pyrotechnics and lights will illuminate the night sky as Londoners greet the new year.
The event, focused on the EDF Energy London Eye, will conclude a momentous year in spectacular style.
Mr Johnson said: "From the Diamond Jubilee to that huge collection of Team GB medals, 2012 has quite literally glimmered with excitement and enthusiasm. A fantastic mood of community has percolated the entire population of our city and beyond.
"We are going to make sure we use the success of this year to deliver more jobs, more homes and more regeneration for London and build on that fantastic sense of togetherness and community to ensure a real volunteering legacy. It's been a wonderful year, but believe me, 2013 is going to be every bit as exciting."
Up to 250,000 people are expected to crowd on to the banks of the Thames to watch the display, with millions more seeing it on television across the UK and overseas.
Following their hard work during the London 2012 Games, more than 150 of the mayor's "Team London Ambassadors" will volunteer at the event to help ensure it is a success. They will be giving out maps, helping direct people to the viewing areas, and providing guidance and advice on getting home safely.
Scots rockers Simple Minds will be headlining the Hogmanay concert and street party in Edinburgh.
The View, Bwani Junction, Reverend and the Makers and The OK Social Club will also be playing to an anticipated crowd of 80,000, and fireworks will be set off to mark the new year.