The holiday, also celebrated in New Zealand, marks the anniversary of New Zealand and Australian soldiers, known as Anzacs, landing on the Gallipoli Peninsula in 1915.
More than 10,000 soldiers from the two countries were killed during the First World War campaign in what is now Turkey, although Anzac Day honours those killed in all wars.
Visiting the site in Canakkale, north-western Turkey, has become a pilgrimage for many Australians and New Zealanders to remember their fallen compatriots but the annual dawn service and other commemorative ceremonies were cancelled this year to stem the spread of Covid-19.
Early on Saturday, three employees of a local tourism company placed red flowers at the Anzac Cove memorial in Canakkale.
In the Australian capital, Canberra, Prime Minister Scott Morrison spoke at a crowd-free commemorative service held inside the Australian War Memorial. A didgeridoo sounded the beginning of the service.
In the Sydney suburb of Wahroonga, eight-year-old trumpeter Lewis Ketteridge and French horn player Grace Colville, 16, were among a dozen brass players playing The Last Post from their driveways at dawn before 40 residents observed a minute’s silence.
“Strangely, it made it more moving that people were still willing to commemorate Anzac Day instead of just letting it go by,” said resident Catherine Colville.
She said the community carefully maintained social distancing as they placed candles, pictures of serving ancestors and wreaths of native leaves and flowers under an Australian flag hanging on a tree.
Marches and gatherings were cancelled for only the third time – the last time in 1942 and previously during the devastating Spanish flu outbreak of 1918.
In New Zealand, where even tighter crowd restrictions are in place, Prime Minister Jacinda Ardern stood at dawn on the driveway of Premier House, the leader’s official residence, for a ceremony.
Thousands around New Zealand participated in the “Stand at Dawn” initiative, and in one Christchurch suburb, bagpiper Tom Glover greeted the families that gathered at each driveway with a rendition of Amazing Grace.