It is alleged that the youth was at the Darwin Bus Exchange and was approached by a male who inappropriately touched her, before fleeing the scene on foot.
The male is described to be of Caucasian appearance, approximately 40-years-old, short light brown slightly balding hair and has a large build.
At the time of the offence he was wearing a dark t-shirt with yellow sleeves, denim jeans, white sneakers and was carrying a black back pack.
Police urge anyone that may have witnessed the event or who may recognise this man, to contact them on 131 444 or Crime Stoppers on 1800 333 000.
Media contact:
Amy Sloan
8922 3365