The Daily Mail has weighed in with their (predictably modern) list:
Die Hard
Home Alone
It’s A Wonderful Life
The Nightmare Before Christmas
Love, Actually
…but mine (probably to no one’s surprise) leans towards the more traditional, in that I’ve applied the Christmas test: Could the events in the movie have taken place at any other time than Christmas? and Did the movie not make you cry?
If the answer is “yes” to either or both, then it’s not necessarily a Christmas movie. So my list (and sorry, but I could not keep it to only five), and in no specific order:
Remember The Night
It’s A Wonderful Life
The Polar Express
The Bishop’s Wife
The Shop Around The Corner
White Christmas
Christmas in Connecticut
…and special (“modern”) mentions because they make me laugh, not cry:
Scrooged (Carol Kane, with a toaster, in the face — classic)
National Lampoon’s Vacation
I love Home Alone, by the way, but for its comedy and not for its Christmas message, such as it is.
Feel free to add your favorites in Comments.