PM O'Neill said Papua New Guinea-Australia relations are in the best shape now than at any time in the 40 years of the relationship.
"I extend to all Australians, and especially to Australians living in Papua New Guinea, my best wishes, and those of the government, and all of our people, best wishes for Australia Day 2016," the Prime Minister said.
"The relationship continues to mature, constantly evolving and diversifying, in a way that is mutually beneficial to the peoples of both nations.