A 20-year-old was assaulted outside the Seagoe Hotel on Church Lane in Portadown.
The incident happened sometime between 1.30am and 2.30am on Friday, 24 April.
The man suffered injuries to his mouth.
Constable Moody said: “We would like to hear from anyone who witnessed this assault or has information in relation to it. We can be contacted in Portadown on 101, quoting ref: 78 240415.”
If you prefer to provide information without giving your details you can contact the independent Crimestoppers charity anonymously on 0800 555 111.