It follows an incident in the Montrose Street area of East Belfast in the early hours of Saturday 12 July.
At approximately 2.20am, a 21 year old was injured by a knife.
He required hospital treatment for his injuries that are not believed to be life threatening.
The 24 year old man is currently assisting police with their enquiries.
Anyone who has any information about this incident is asked to contact CID in Musgrave Police Station on the non emergency number 101.
Or if someone would prefer to provide information without giving their details, they can contact the independent charity Crimestoppers and speak to them anonymously on 0800 555 111.