Two sexual assaults have been carried out on the Mapperley Park area within 12 hours of each other.
The first incident happened at about 5pm on Thursday, December 1, and the second at about 5.30am on Friday, December 2.
Both incidents happened in the Mansfield Road/Redcliffe Road area of Mapperley Park and the women were touched inappropriately.
The man is described as a white male, aged 15-20, of stocky build and quite short. He was wearing a blue Adidas tracksuit.
Anyone with information is urged to contact Nottinghamshire Police on 101, quoting incidents 584 of 1 December 2016 and 320 of 2 December, or call Crimestoppers anonymously on 0800 555 111.