The woman was attacked at about 01:15 on Saturday 26 September as she was walking in Holm Street near Wellington Street.
The man on CCTV was described as being white, aged 25-30, of slim build with short, dark hair.
He was wearing a dark hooded top, blue jeans and white trainers.
Police have released CCTV images of a man they want to speak to in connection with the rape of a 24-year-old woman in Glasgow city centre.