Officers with the Anaheim Police Department responded to the 900 block of South Sherrill Street at around 10:25 p.m. after receiving calls about shots being fired at a party.
When they arrived, police say they got into some sort of confrontation with the 18-year-old, who has not yet been identified, before an officer shot him.
"The male suspect was struck at least once by police gunfire," read a statement issued by APD.
The suspect was taken to the hospital in stable condition. No officers were injured during the shooting.
A gun believed to belong to the suspect was located at the scene.
The shooting remains under investigation.