Authorities said they received a call around 1 a.m. about a "man down" in the 300 block of North Rockvale Avenue.
When officials arrived, they found the 38-year-old victim lying in a planter bleeding from a head wound. The man was conscious but incoherent.
He was transported to the hospital, where it was determined that he suffered from a gunshot wound. The victim's condition was not immediately known.
Investigators are trying to determine the circumstances surrounding the shooting. Anyone with information was asked to call the Azusa Police Detective Bureau at (626)812-3200.