The Lord of the Rings! I have to rewatch them in December.
And this year, I watch the movies with my kids for the first time. But we make pauses in between, they can not watch 3 hours in one go. LOL.
Almost every old Disney movie, especially Aladin, Lion King, Alice in Wonderland, etc.
Three Wishes for Cinderella (3 Haselnüsse für Aschenbrödel is the original name) is another traditional movie, we watch around Christmas.