A 21-year-old woman was sexually assaulted on Saturday as she walked along a cut through between Beanfield Avenue and Barnsley Square, Corby.
The incident happened sometime between 8.50pm and 9pm, after the woman was dropped off in Beanfield Avenue.
She was approached by a man who inappropriately touched her as she walked along the cut through.
The man was white, with a tanned complexion, about 6ft, with dark coloured, short hair.
He was of average build and was aged between 35 and 40.
The offender wore a black hooded top with a pocket on the front, and had a deep voice with an English accent.
During the incident the woman hit the man and believes she may have left a scratch on his face.
Officers would like to speak to anyone who may have witnessed this incident or have any information regarding it.
Witnesses to this incident, or anyone with information about it, can call Northamptonshire Police on 101 or information can be given anonymously to Crimestoppers on 0800 555111.