Three of the victims were shot and the fourth was stabbed.
It happened in the Louis Pink housing development in the East New York section around 5 p.m. on Tuesday.
A 23-year-old man who was shot died.
The rest of the victims are all men and all alive. A 19-year-old was stabbed twice, a 20-year-old was shot once, and a 22-year-old was shot once.
No arrests have been made and police are trying to figure out what caused the violence.