An investigation was launched in May when officers received a report of an assault inside an address.
On arrest, PC Lewis Rollins made attempts to lie about his identity and was later charged and suspended from duty.
He has been found not guilty of intentional suffocation and actual bodily harm, relating to a separate victim.
He will be sentenced in March.
Detective Chief Superintendent Christina Jessah, who leads policing in the Central West area, said “PC Rollins’ actions are completely unacceptable and at odds with the Met’s values.
“I commend the women who have demonstrated extreme strength and bravery throughout this investigation. Our Directorate of Professional Standards is now progressing a misconduct investigation which remains ongoing.”
