The gunfire rang out in the rear of the home on 230th Street in Brookville at around 12:30 a.m. Friday.
A 20-year-old man was shot in the torso and thigh.
He was taken to Jamaica Hospital in critical condition.
A 19-year-old woman was grazed in the back by the gunfire.
She went to the hospital with non-life-threatening injuries.
Later Friday morning, a man walked into Long Island Jewish Valley Stream hospital with a gunshot wound to the thigh. He said he was also shot at this party.
No arrests were immediately made.
The motive for the shooting is under investigation.
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