The incident happened during the food and drink service onboard flight QR017, which landed in Dublin shortly before 1pm.
Six passengers and six members of crew were injured, eight of whom required hospital treatment, the BBC reports.
Qatar Airways told the broadcaster "a small number" of passengers and crew sustained minor injuries and were receiving medical attention.
It added an internal investigation was under way. The flight was operated by a Boeing 787-9 Dreamliner aircraft.