Prisoners will not receive visitors and will be fed a lunch worth $4 on Christmas Day this year, Corrections Services says.
For the 8500 people in the country's prisons, December 25 will "resemble a day much like any other".
Inmates will be allowed to attend church services and some, depending on their security classification, will have the opportunity for "recreational activities such as sport and music".
The main meal of the day, usually served for dinner, will be served at Christmas lunch while the dinner meal will consist of the sandwiches usually served at lunch.
"The meal will meet basic nutritional requirements but will not be lavish and prisoners who wish to attend church services on the day will be able to attend multi-denominational church services inside the wire," Corrections Services general manager Dr Brendan Anstiss said.