As of my knowledge cutoff date of September 2021, Dunkin' Donuts is typically closed on Christmas Day, which falls on December 25th, 2023. The holiday closure allows the restaurant employees to spend time with their families and enjoy the festive atmosphere. However, it's possible that individual Dunkin' Donuts locations may choose to remain open on Christmas Day, depending on their local policies and the availability of staff. I would recommend checking with your local Dunkin' Donuts restaurant or visiting their website for specific holiday hours and closures.