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.
Young Wicklow Readers Celebrated at Ballywaltrim Library
The Summer Stars signed up more readers than ever before.
Met Éireann Issues Status Yellow Rain Warning for Wicklow
Heavy rain and thunderstorms are possible from noon tomorrow.
Tender Issued For DART Charging Infrastructure In Wicklow Station
Rail traffic will be transformed with far greater connectivity between Dublin city centre and Wicklow town
Almost 1,200 Wicklow Children Waiting for Early Years Places
Staff turnover in Wicklow crèche settings is well above the national average
Wicklow Hosepipe Ban Extended As Supplies Remain Under Pressure
Uisce Éireann says another month of shorter showers, reduced use of washing machines, and using a watering can is needed.
8:00pm - 10:00pm
Love Songs on the Coast
Light rain
High: 18°C | Low: 15°C
Light rain
High: 18°C | Low: 15°C
Light rain
High: 18°C | Low: 15°C
Light rain
High: 19°C | Low: 15°C
Light rain
High: 19°C | Low: 15°C