The Southampton-based cruise giant said the Covid-19 pandemic had not only affected the holidays of its guests but had also impacted "every part of our business; our future deployment; the guest experience; our supply chain and our people on-ship and on-shore".
Although no figure has been placed on the number of jobs that may be affected, the Southern Daily Echo reported "staff had been told 450 positions were at risk".
A Carnival spokesperson said: "Our priority is to treat everyone with fairness and respect and to have open and honest conversations. These changes, whilst very difficult, are to ensure the future sustainability of our business.