"This will come as no surprise to the many people who have experienced it."
The most common age group targeted were aged between 18-34.
“Younger people were much more likely to experience online harassment. This is unsurprising as they generally use the internet more. Yet the meaner side of internet impacts all kinds of internet users," Ms Swann said.
“Experience of this more extreme abuse was much higher in younger groups and among those who use the internet most often.”
Source: The Australian institute
Political and religious beliefs targeted
The most common form of abusive language was directed at the person (29 per cent), their political beliefs (9 per cent) or their religious or ethnic background (7 per cent).
Unwanted sexual messages, online publications of personal details aimed at intimidation and the threat of stalking were the other most common forms of online harassment.
The study found a quarter of those who had experienced sexual harassment had sought out a medical professional, while 25 per cent also said it had impacted their work.
The cost of online harassment and trolling was estimated at $3.7 billion in health costs and lost income.
Women more likely to experience harassment
The survey found women were 10 per cent more likely to be the target of harassment.
Of the 44 per cent of women who said they had been harassed online, nearly a quarter had received "unwanted sexual messages or unwanted nude pictures". This was 11 per cent higher than the rate for men.
“While substantial numbers of both men and women experienced harassment, women were more likely to experience it, particularly sexual forms of harassment," Mr Swann said.