A police officer has been charged with seven counts of rape in relation to an incident that took place in September.

Sex Assault Squad detectives charged a 44-year old Sergeant attached to the Mandurah Police District with seven counts of aggravated sexual penetration without consent.

Police allege the incidents took place at a private residence while the officer was off-duty on September 24.

The officer has been stood down from operational duties and will appear in the Rockingham Magistrates today.