New year celebrations reach all of the Americas after Australasia, Asia, Europe and Africa all mark the start of 2025
Parts of Alaska, all of Hawaii and island nations in the South Pacific will be the last to ring in the new year
In the UK a dazzling fireworks display lit up London after some events elsewhere were cancelled because of bad weather
Syria has seen in its first new year since President Bashar al-Assad was deposed - revellers in Damascus were entertained by fireworks and DJ sets
Dubai and Abu Dhabi in the United Arab Emirates both put on spectacular displays when the clock struck midnight - you can see the shows here
Watch our top picks of the world's celebrations
The ball has dropped in New York City's Times Square, which is filled with crowds braving the rain to welcome the new year.
It’s also midnight in Ottawa, Canada - happy new year!
In New York, in the US, Times Square is the centre of the countdown to midnight.
But the thing that everyone is looking forward to is called the ball drop, which is when a glowing ball is lowered down a big flagpole, to signal the start of the new year.
A Waterford crystal-encrusted, five-tonne ball flashing with more than 30,000 LEDs will descend to the bottom of a specially-designed flagpole as the new year arrives.
Image source, Getty ImagesThe ball will move down the flag pole in New York, reaching the bottom as the clock hits midnight
People have been celebrating New Year's Eve in Times Square since 1904.
As a result, other cities in the US now have their own traditions of dropping things on New Year's Eve.
In Vincennes in Indiana, for example, people drop watermelons to the ground from high up.
The east coast of the US is about to welcome the new year in about half hour's time.
Here are some of the latest pictures we've seen from Times Square in New York City as crowds prepare for the annual ball drop.
Image source, ReutersRozonda Thomas of TLC performing at Times Square
Image source, ReutersSinger Rita Ora attends new year celebrations in the rain
Image source, ReutersThese party-goers won't be letting a bit of rain spoil tonight's fun
Amy Walker
Live reporter
A 14-year-old boy has died in a firework-related accident on New Year’s Eve in Rotterdam, according to local reports.
The incident took place at about 20:30 CET (19:30 GMT) in the Delfshaven district, according to Dutch news outlet NRC, external.
He was reportedly found on tram tracks and could not be resuscitated, according to Algemeen Dagblad, external.
Details are still emerging about the accident and it is not clear whether the boy set off the fireworks himself, according to reports.
It's just gone midnight in the Dominican Republic, Venezuela, Bolivia and Puerto Rico.
The province of Nova Scotia in Canada has also now officially entered 2025.
Image source, ReutersAs we've been reporting, the party is well underway in Rio de Janeiro.
These latest pictures show the moment the Brazilian city lit up during its fireworks display.
Image source, Reuters
Image source, Reuters
Jack Burgess
Live page editor
We've just seen another spectacular fireworks display, this time from Rio de Janeiro as parts of Brazil enter 2025.
Here's the scene along the city's famous Copacabana beach, where huge crowds have gathered to greet the new year:
Watch: Moment Rio de Janeiro enters 2025
Happy new year to some of South America!
Some of Brazil, including the capital Brasilia, Rio de Janeiro and Sao Paolo, are officially in 2025.
Also joining the party are Argentina, the Magallanes region of Chile, French Guiana and Bermuda.
In half an hour, the Canadian region of Newfoundland and Labrador will enter the new year.
If you're just joining us, here's a reminder of when different parts of the globe enter the new year.
The island nation of Kiribati in Oceania was the first to welcome the new year - at 10:00 GMT, shortly followed by New Zealand at 11:00 GMT.
Here are some of the other times around the world:
The celebrations just keep coming. Firework displays have lit up the skies around the globe.
But in case you haven't kept up with the parties, enjoy pictures of the displays:
Image source, ReutersIn Syria, it's the first new year in decades where the country is no longer under Assad-family rule. In Damascus, they set off fireworks for the occasion
Image source, Getty ImagesFireworks light up the night sky to welcome 2025 in Baghdad, Iraq
Image source, ReutersA drone show filled the sky over the ancient Parthenon temple atop the Acropolis hill, in Athens, Greece
Image source, EPAPeople celebrate the New Year outside the Kremlin in Moscow, Russia
And the clock strikes midnight in Greenland.
Many in Greenland celebrate the welcoming of 2025 twice in one night. Once when the year begins in Denmark (four hours earlier) and again at 00:00 local time.
Image source, ReutersPeople react as they take part in New Year celebrations in central Moscow
Speaking 25 years to the day since his first national address as acting president of Russia, Vladimir Putin told Russia in a midnight address that he was confident "everything [would] be fine" in 2025.
"And now, on the threshold of the new year, we are thinking about the future," he said.
"We are confident that everything will be fine, we will only move forward. We know for sure that the absolute value for us was, is and will be the fate of Russia, the well-being of its citizens."
He pays tribute to soldiers fighting in Ukraine but did not mention anything specific about the war or the economy.
Inflation reached 9.5% in Russia this year, according to Reuters news agency, following the central bank's decision to hold its key interest rate at 21%.
Blanca Estrada
US reporter
Image source, Getty ImagesIn a few hours, New York City will ring in the new year (at 05:00 GMT).
About one million people are expected to attend the iconic ball drop in New York's Times Square.
And there will be a noticeable police presence. Police commissioner Jessica Tisch says there is no specific credible threat, but they are operating in a "heightened threat environment".
The security plan has also been "calibrated" to account for the Christmas market attack in Germany, according to a briefing with local authorities.
Some intersections in midtown Manhattan will be blocked by rubbish lorries to stop vehicles entering pedestrian areas.
Party-goers should also expect to see drones deployed overhead to monitor the crowds. And according to a security briefing with Tisch, "all manholes, mailboxes, vending machines and litter baskets in the frozen zone will be either sealed or removed".
We've been hearing from some of the revellers getting ready for the new year party:
Watch: Party-goers in New York get ready for new year celebrations
Image source, Getty ImagesIt’s been a long-running tradition for the British royal family to head to their Norfolk estate of Sandringham House to ring in the new year.
This will be the third new year’s without the late Queen Elizabeth II, but King Charles III seems set on carrying on the tradition.
Family members will also join, in a night rumoured to include lots of party games. Before he was King, Charles would go to Birkhall, his Scottish home on the Balmoral estate, to celebrate.
On New Year’s Day, the royal couple will attend a service St Mary Magdalene Church in Sandringham.
We can now move to the Atlantic Ocean, where the Azores have become the latest part of Portugal to welcome the new annum.
Up next is the Brazilian archipelago Fernando de Noronha, where midnight strikes at 02:00 GMT.
Martine Croxall
BBC News presenter
In 2025, I have resolved to have micro-adventures right on my own doorstep, to see those places really close to where you live that you've never got round to seeing.
It doesn't take a lot of planning or money, and it doesn't require very much willpower at all!
Watch: BBC News presenter Martine Croxall shares her new year's resolution for 2025
As midnight approached, revellers lined the River Thames to see this year's massive fireworks display.
Here are some of the best pictures we've seen of the dazzling show:
Image source, PA Media
Image source, PA Media
Image source, EPA
Chris Mason
Political editor
Alongside all the predictable, boring and almost certain-to-fall-short lofty aims (more sleep/exercise/healthy food blah blah blah) and the never-to-be-under-appreciated hope for a healthy 12 months ahead, my mind inevitably turns to what I spend my professional life thinking about.
What will be the big talking points of 2025, the flashpoints, the rows, the successes, the failures?
People are always demanding of predictions on days like this - to which I like to say, "it’ll be noisy".
Sufficiently vague to never be wrong - and hey, if news was predictable that would be boring!
Best wishes to all for the year ahead.
The traditional bongs of Big Ben have ushered in 2025 as onlookers lined the Embankment in central London for a spectacular fireworks display.
You can catch some of the best moments in this short clip:
Watch: London's spectacular New Year fireworks display
Image source, Getty ImagesThe year of the wood snake will begin on 29 January in 2025 along with the Lunar New Year
The Chinese zodiac says 2025 will be the year of the wood snake.
In Chinese tradition, each year is represented by one of 12 different animals, which feature in the Chinese zodiac: Rat, Ox, Tiger, Rabbit, Dragon, Snake, Horse, Goat, Monkey, Rooster, Dog and Pig.
Each year, one of these five elements are also incorporated: metal, water, wood, fire, and earth.
The last year of the wood snake was in 1965.