The incident happened in the High Street area of the town.
A man left with facial injuries following a city centre attack will require further medical treatment, police said.
The 33-year-old victim was attacked at around 11.45pm on Monday.
Investigating officer constable Tom Cameron said: “This was an upsetting incident for the victim who has, and will, require further medical treatment.
“The city centre was busy on Monday night with the arrival of students and so I would ask that if anyone was in the Langstane place or Dee Street area at the time and remembers seeing this incident or anything suspicious to contact police.”
Anyone with information is asked to contact Police Scotland on 101 quoting reference 26 of 5th September.
Man left with facial injuries after Aberdeen attack
