What Day Is Orthodox Christmas 2025. A large majority of russia’s 140 million people identify as members of the russian orthodox church, which calculates the date of christmas based on the julian calendar instead of the gregorian calendar used in the west. Peter’s basilica in rome as christmas marks the start of the 2025 holy year celebration.

The nativity of our lord god and savior jesus christ. Orthodox christmas day for the year 2025 is celebrated/ observed on tuesday, january 7th.