Sea Princess is completing the final leg of a 2-week roundtrip between Brisbane and NZ.
Queensland Health confirmed that onboard testing found norovirus to be the cause of the increased gastro cases.
Around 200 people are believed to have been infected with the virus, according to a spokesperson.
In an email to passengers, the cruise line said it had been "carrying out a comprehensive sanitation program in coordination with several international public health authorities".
Princess Cruises have also arranged for the vesse to undergo additional disinfection in Brisbane.For reports on cruise ship accidents see our CruiseMinus section.