Translink is advising passengers that a special timetable will operate over the Christmas and New Year holidays.
It will come into effect from Tuesday, December 24 and lasting up to and including January 1.
No Ulsterbus, Metro, Goldline, Airport Express, NI Railways or Enterprise services will operate on Christmas Day.
There will be some limited Goldline, Ulsterbus and Metro services operating on Boxing Day.
A special Ulsterbus 238 service will operate between Newry Buscentre and Belfast (Europa Buscentre) on Boxing Day.
Special holiday timetables will operate on many services between December 27 - January 2.