It's A Wonderful Life
A Christmas Story
Die Hard (hell yes it's a Xmas movie!)
Honorable Mention:
Home Alone
Polar Express
Elf
Hallmark Xmas movies(can't pick one...all are kinda the same...random person comes to town for Xmas, meets a person who lives there, falls in love, has a significant other that they end up breaking up with to be with them, has to move away/break up due to xxx, realizes the person is the love of their life and moves back to be with them, gets married, ends happily ever after...I'm such a sucker for them tho, can't stop watching them 😂)