A night bus sex pest repeatedly rubbed himself up against a young woman during an early hours service from the West End to east London.
Shah Ahmed, 34, of Ethel Road, Canning Town was convicted by a Snaresbrook Crown Court jury of sexual assault and will be sentenced on December 1.
The incident ocurred at 1.00am on October 27 on a N25 bus travelling along Oxford Street as the 25-year-old victim was travelling home after a Saturday a night out.
The victim got off the bus and reported the incident to police.
The Roads and Transport Policing Command (RTPC) Sexual Offences Team led the investigation and obtained CCTV footage from the bus.
This investigation led to Ahmed being identified and he was arrested on November 19.
Acting Superintendent Andrew Johnstone of the RTPC said: "Sexual assaults on the transport network will not be tolerated and anyone who commits such offences will be caught and prosecuted.
"If someone has made you feel uncomfortable on your bus journey - however minor it may seem to you - reporting it to police can help us target the perpetrator and prevent it happening to another passenger."
Siwan Hayward, Transport for London's Deputy Director of Enforcement and On-Street Operations, said: "We care about our passengers and every journey they make and do not tolerate unwanted sexual behaviour or crime of any kind on our transport network.
“I am pleased this offender has been found guilty for his grossly unpleasant, and completely unacceptable crime.
"Overall our transport network is a safe, low crime environment. Over ten million passengers use our public transport services each day with very few ever experiencing or witnessing crime."