All of the students arrested on Wednesday night and Thursday morning were for Public Order offences and may appear in court later this month.
Gardaí at Mill Street station in the city centre have been flooded with complaints since the start of the week.
In the most serious incident, when hundreds of students gathered and made a bonfire at the Dun na Coiribe estate on the Headford Road on Monday, students threw bottles at fire crews who came to extinguish the blaze.
In another incident, two young female students went naked around a housing estate.
The president of NUI Galway, Dr Jim Browne, has called for an end to “College Week” and college officials have warned offending students will be expelled.