PC Tony Watts, of the North Area Command Unit, helped police Enfield and Haringey.
He was put under investigation after an incident which happened between mid-January and early February in 2020, when he was off-duty.
Following a trial at Croydon Crown Court, he was found guilty and remanded in custody on Tuesday (July 8).
He was arrested after the incident was reported in May 2022.
Watts was then bailed before being charged with rape on September 25 last year and suspended from duty.
He will be sentenced on August 11 at the same court.
Detective Chief Superintendent Caroline Haines, who leads the North Area policing team, said: “PC Watts has shown a complete disregard for this victim-survivor and for his duty to protect women and girls – in the vilest way.
“We are going above and beyond at the Met to rid the force of those who corrupt our integrity, and it is quite right that PC Watts has been held accountable for his actions.
“It would have taken a huge amount of courage and strength to speak to police, the way this victim-survivor did, and I hope this conviction provides some closure.
“My message to any other victims who may have experienced a sexual encounter they felt wasn’t right is that they can and should come forward, and we will do everything we can to support you.”
The Met’s professional standards team is aware and a misconduct hearing will now follow as soon as possible.
