The incident took place on Wednesday, 14 February, at about 10.30am in a shop in Crown Walk.
The victim, a 19-year-old woman, was approached by a man who touched her inappropriately.
Designated Investigator Samantha Arnold, of the Investigation Hub, based at Milton Keynes police station, said: “I would like to speak to the man in these CCTV images, as he might have information which is vital to our investigation.
“If you know this man, or have any information which you think could help our investigation, please call the Thames Valley Police non-emergency number on 101.
