The teen, whose identity has not been released, was found at about 4 a.m. suffering from stab wounds after officers were dispatched to the 1700 block of Schulte Drive, police said.
The man was taken to Regional Medical Center in San Jose and pronounced dead a few hours later.
No arrests have been made in the case, which was San Jose's 21st homicide of the year, police said.
The motive and circumstances surrounding the stabbing remained under investigation today.
Anyone with information about the incident is asked to call Detective Sgt. Rafael Nieves or Detective Glenn Albin in the San Jose police homicide unit at (408) 277-5283.
Those wishing to remain anonymous can call crime stoppers at (408) 947-STOP (7867). Tipsters might be eligible for a reward.