The HSE says that more than half of Irish adults say they know young people who get drunk regularly, but think there's nothing they can do to stop it.
The HSE says its research has found that 90% of adults think underage drinking is a problem in Ireland.
However, one-in-five think it is okay to drink alcohol before the age of 18.
The research coincides with the launch of a new TV and radio campaign highlighting the risks of drinking at a young age.