Osman Hamsharzad, 40, is wanted in connection with an assault.
He has known links to Barry, Canton and Roath.
Anyone with information is being asked to contact South Wales Police using reference number 2600174739.
Members of the public can contact South Wales Police online, by calling 101 or via Crimestoppers anonymously on 0800 555 111.
South Wales Police have also issued a reminder to always call 999 in an emergency.
