It happened at a house in the Fairways estate at around 4:30am this morning.
He sustained a number of stab wounds and was taken to St Luke's Hospital.
Another male teenager was arrested at the scene in connection with the assault, and investigations are ongoing.
Sinn Féin Say Wicklow Rent Hikes Forcing Families Into "Impossible Choices"
Sinn Féin TD warns of devastating impact as Council considers 100-200% increases; protest planned for Monday
Wicklow Sports Clubs Encouraged To Apply For Funding For Community Facilities
Wicklow Commuters: Have Your Say on Dublin-Wexford Rail Line
The long complained about service is up for discussion at a public meeting in Gorey.
Blessington Farm Steps Into National Spotlight
Tinode dairy farm hosts National Dairy Council campaign celebrating Irish agriculture
Two Weeks To Budget 2027: Simon Harris Focusing On Income Tax, Energy Support & Childcare
Tánaiste, Wicklow TD and Finance Minister outlines two-week countdown to budget announcement, emphasising cost-of-living priorities
8:00pm - 10:00pm
Love Songs on the Coast
Sunny intervals
High: 19°C | Low: 12°C
Medium-level cloud
High: 18°C | Low: 12°C
Light rain
High: 18°C | Low: 12°C
Sunny intervals
High: 19°C | Low: 11°C
Medium-level cloud
High: 19°C | Low: 12°C