I have a few. It's A Wonderful Life, A Christmas Story, Martin the Cobbler, An American Christmas Carol with Henry Winkler as Scrooge.

It's A Wonderful Life - all time fav though i feel it is a life movie not a Christmas movie and most of it doesn't even happen on Christmas LOL . There is an excellent version of a Christmas Carol with Patrick Stuart as Scrooge, and I love the Disney animated version as well.

It probably isn't a Christmas movie. It's just that it's usually Christmas when it gets aired.

White Christmas with Bing Crosby has been my favorite since I was a young kid ! One year I found it on a DVD it was my Christmas gift to me that year !

Trading Places. Eddie Murphy

Gremlins or Die Hard are good too

Talladega Nights The Ballad of Ricky Bobby.
Won Academy Award for Best Movie Ever Made.
And don't be sayin it didn't even come out at Christmas time.
I watch it every Christmas and it brings me untold Great Tidings every year on Christmas Day!

Elf..:.
It’s a wonderful Life

Christmas Vacation

I can't choose a single favorite (and some of my favorites have already been listed), but the animated movie Klaus that came out in 2019 is excellent and flew under the radar for most people (although it did get an Academy Award nomination).

You watch Christmas vacation as a kid and assume you are going to be Clark. Only by midlife do you realize you have become Uncle Eddie.

Not my favorite, but I watched a Hallmark movie with my wife. Try it, you might get an early Christmas present.

It's a wonderful life

And elf

The first Rambo

Not exactly Christmas movies, but every year the kids and I watch John Wayne movies all day. I really look forward to it. Christmas with the Duke.