One of the victims is in critical condition.
Authorities say 17-year-old Oneil DaSilva from Mt. Vernon, N.Y., opened fire around 3:40 a.m. Sunday at the party in the Bronx.
It happened at 651 East 221 Street in the Williamsbridge section.
A 24-year-old man was shot in the chest and hospitalized in critical condition.
The other victims include a 21-year-old man shot in the thigh; a 19-year-old man shot in the buttocks; a 24-year-old man shot in the forearm; a 14-year-old girl shot in the back; a 17-year-old boy shot in the pelvis; an 11-year-old boy shot in the leg, and a 13-year-old girl shot in the thigh.
All are in stable condition.