An estimated 1.6 million people flooded into central Sydney to watch the country's largest New Year's Eve fireworks display, with some harbour-side viewing spots reaching capacity as early as 8:30pm.
The Sydney display — which cost $7 million — was themed "city of colour" and the bridge was the centrepiece of celebrations.
Thousands of revellers claimed their vantage point at Mrs Macquarie's Chair after a throng of partygoers arrived on Thursday morning to secure a spot.
Some people even set up camp at McMahons Point two days ahead of the fireworks display for a prime view.
In Melbourne, about half a million people packed the city with the banks of the Yarra all but claimed ahead of the early fireworks.
Those with a view of the city skyline were treated to 10 tonnes of fireworks exploding into the sky at midnight.
In Canberra, most of the fireworks were launched from City Hall with coloured flames also shooting from roofs at Civic Square.
In Tasmania, thousands danced the new year in at the Falls Festival in Marion Bay.
And despite a forecast top of 39 degrees Celsius for Adelaide and other centres in SA, tens of thousands flocked to traditional hotspots to ring in 2016.
Beachside events at Brighton and Glenelg were again very popular and in the city centre the biggest midnight fireworks ever staged by Adelaide City Council exploded from Torrens Lake.
Launceston's main celebrations were at Royal Park and in Hobart, with families surrounding the waterfront precinct for a night of entertainment and fireworks.
Revellers in Brisbane enjoyed more than 30,000 fireworks — launched from five barges on the Brisbane River as well as three rooftops — an hour after celebrations began in southern states.
Thousands packed into prime vantage points at South Bank with restaurants, pubs and clubs also full to the brim.
Darwin will see in 2016 with the first midnight firework show at the Waterfront ever as revellers enjoy an Aussie-outback-themed event.