More than one million people gathered in Times Square in New York - leaving behind 3.5 tons of confetti.
Fireworks over the Sydney Harbour Bridge in Australia - the theme was Diamond Night in the Emerald City.
Thai bar hostesses celebrated in Bangkok, despite several bomb blasts that rocked the capital earlier in the day.
New Year festivities at the Copacabana in Rio de Janeiro, Brazil. The country inaugurates President Luiz Inacio Lula da Silva for a second term on Monday.
Bulgarian revellers welcomed the new year and the country's accession to the European Union in Sofia.
A firework display for revellers at the royal castle in Warsaw, Poland.
Bad weather did not hamper celebrations in London where thousands partied along the banks of the Thames.
Hundreds of thousands of people celebrated in Berlin as fireworks went off by the Quadriga at the Brandenburg Gate.
...but some in Nantes, France, decided to have an anti-party party, protesting against 2007.