The number of assaults causing harm rose by one fifth between 2012 and 2015 in greater Dublin.
Gardaí are today launching a new awareness campaign targeted at men to reduce the number of assaults.
The vast majority of assaults are carried out by men on other men aged between 18 and 39 on nights out.
"Use your brain, not your fists" is the message from Gardaí in a new campaign to target the number of assaults.
Men are overwhelmingly the victims and the perpetrators and most attacks take place at the weekend between 8pm and 5am.
While assaults have gone down nationally this year, there has been a marked increase in assaults causing harm in the capital and surrounding areas - with 1,700 reported last year - up from 1,400 in 2012. Minor assaults rose to 3,337.
However, the statistics only paint part of the picture as assaults are typically underreported, by around 45%.
Young men are being urged to plan their nights out carefully, not to walk in dark areas alone, and to let others know where they are and when they will be home.
They are also being reminded of the consequences of assaulting someone - they could lose their job, their ability to travel, and even go to jail.