A 50-year-old police officer has made his first appearance in the Perth Magistrates Court after being charged with assault occasioning bodily harm.

It is alleged Senior Constable Steven Adrian Trewin committed the assault while arresting a 19-year-old woman on August 25.

Trewin was not required to enter a plea and was released on a $1,000 bail.

He has been stood aside from operational duties and is due to next appear in court on December 18.