Go to the Internet Movie Database. Go to Power Search. Specify that you want movies whose plot summary contains the word “Christmas”. You might want to limit the search to American movies or English-language movies or to just the highest rated movies.
“We’re No Angels.” Not the recent one with De Niro, but one made in 1955. 3 convicts - Humphrey Bogart, Peter Ustinov and Aldo Ray - escape from Devil’s Island and decide to rob a local merchant (Leo G. Carroll) before making their getaway. Instead, they become involved in the lives of the merchant, his wife and his daughter - and Leo’s despicable cousin Andre (Basil Rathbone). Most of the action takes place on Christmas day.
If you want to count Xmas themed TV shows, one of my other favorites is an Avengers episode, “Two Many Christmas Trees.” I have to admit what I like most are the in-jokes. For example, Steed gets an Xmas card from his former partner, Mrs. Gail. He makes the comment, “What can she be doing at Fort Knox?” The joke is, Mrs. Gail was played by Honore Blackman and Blackman was currently starring as Pussy Galore in “Goldfinger” (which of course involves Ft. Knox).
The plot of the episode involves a Christmas house party at the estate of an eccentric millionaire and expert on Charles Dickens. The expert was played by Mervyn Johns - who was Bob Cratchit in the 1951 version of “A Christmas Carol.”
Oops. You just wanted titles, not all this chitchat. You can add “The Bishop’s Wife” and its remake, “The Preacher’s Wife.”
National Lampoon’s Christmas Vacation
Lethal Weapon (opens with gunfight at a christmas tree lot)
Silent Partner (creepy film with Elliot Gould and Christpher Plummer)