An 18-year-old man is in an induced coma following an out of control party last night.

He was just one of the casualties in a night of wild parties across the state that required police intervention.

A police officer was also kicked unconscious at one of the parties.

Inspector Mal Anderson said police received numerous reports of out-of-control parties across metropolitan Perth and regional parts of Western Australia where people were fighting and throwing bottles.

Police said the man in an induced coma at Royal Perth Hospital was hit on the head at a party in Seville Grove that required 12 police vehicles to attend.