PC Rupert Edwards has been convicted of attacking the woman at a New Year’s Eve party in 2018 while off-duty.
The offence was reported to police in October 2023.
Edwards was attached to South West Command Unit, which covers Kingston, Merton, Wandsworth and Richmond.
Chief Superintendent Dan Knowles, in charge of policing for south west London, said: “This was a despicable offence and I have huge admiration and gratitude for the victim for having the courage to come forward and report PC Edwards.
“Detectives in this case carried out a diligent investigation, ensuring PC Edwards was charged at the earliest opportunity and that the most compelling evidence was brought before the courts.
“It was a bold step to use evidence from his previous trial to support this latest prosecution and demonstrates our commitment to supporting victims of police perpetrated abuse.
“Dangerous offenders of all types who seek to harm women and girls will be relentlessly pursued and justice will be served.
“My message to anyone who may have experienced something that didn’t feel right is that you can and should come forward. You will be listened to, and we will do everything we can to support you.”
