I don't have a favourite, but I have a bunch of movies I like to watch every year around Christmas time.
Black Christmas (original), I discovered this late one night about 15 years ago when it was on tv around Christmas time. I'd never heard of it but it sounded good. It immediately became one of my favourite horror movies and still is to this day. It's also a traditional Christmas movie for me, if a rather unconventional one.
Batman returns, as a kid I couldn't wait to see this and was just slightly too young to get into the cinema to see it, so my parents were buying me the VHS for Christmas. One of the most exciting presents I've ever got. Haha. Still watch it every year and is one of my favourite batman movies, probably for that reason.
How the grinch stole Christmas, the original cartoon, not the movie, this I'd just brilliant and I often put it on while I'm wrapping presents. Absolutely love it.
Scrooged, bill Murray is just fantastic, love very second of this movie. Though as a kid some bits creeped me out.
Muppets Christmas carol, love, LOVE this interpretation. And Michael Caine, awesome.
Nightmare before Christmas, another one I've loved since my childhood. Never tire of watching this.
Home alone 1 and 2. Pretty self explanatory I'm sure. Who doesn't love these.
Jingle all the way, not quite up there with my other choices but my girlfriend loves it and I've got more of an appreciation for it lately. So we'll be given that a watch too.
Also will watch the tales from the crypt episode "and all through the house" and maybe the movie silent night deadly night. And I'm gonna scroll through this thread and see if I find any other hidden gems.
Rant over. Lol. Sorry about that.