A shot was fired through the window of a house in Corduff Grove, in Blanchardstown, west Dublin, at about 4.20am today, gardaí said.
Two young men and a young woman were wounded by the single shot.
They are aged between their late teens and mid 20s, a Garda spokeswoman said. It is believed they were sitting on a couch in the front room at the time of the incident.
The three were taken to James Connolly Hospital in Blanchardstown for treatment.
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It is believed their injuries are not life threatening. There were a number of youths in the house at the time of the attack.
No one has yet been arrested. A Garda spokeswoman said investigations are ongoing.