Sir Bernard Hogan-Howe is to retire after five years as the commissioner of the Metropolitan Police, the force has announced.
Sir Bernard, who was appointed to the role in September 2011, will remain in post until February to allow for his successor to be appointed.
During his time in charge, he oversaw policing of the London riots and the Olympic Games.
Sir Bernard said it had been a “great privilege” to serve as commissioner.
“I have loved my time in the role and I have loved being a police officer,” he said.
“It’s the most rewarding of jobs to protect good people and lock up the bad guys.”
According to the Met, crime has fallen by around 18% during the time Sir Bernard has been in post.
However, he has also faced controversy including questions about the Met’s handling of inquiries into historical abuse allegations.
A 16-month investigation was launched after claims that boys were sexually abused by public figures more than 30 years ago, but it closed in March without a single arrest.
Home Secretary Amber Rudd called Sir Bernard a “determined crimefighter and an inspirational senior officer”.