I have 18 movie versions of Charles Dickens' novel, A Christmas Carol, in my personal collection. And I watch all of them each Christmas season. Here is where you may find as many versions of the movie as I can find online for free viewing. They are listed in the order I found them, not according to my personal rating of their worth.
First up, from 1984, starring George C. Scott as Scrooge, free on YouTube and hence embedded here:
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Nest is Scrooged, starring Alistair Sim. This movie has received high marks for Sims' performance as Ebenezer Scrooge.
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Next is is Patrick Stewart playing Scrooge from 1999. This one has become an almost instant classic.
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This version stars Guy Pearce as a younger Scrooge than we usually imagine. And it is more based on the novel's theme than its narrative, although the character's names are the same. Hence it is a reboot of sorts, rather long (almost three hours) with many added scenes, and Marley's ghost has a much larger part. But I give it good marks for staying faithful to Dickens' themes.
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Here is the first movie of the novel with sound, 1935's Scrooge, starring Seymour Hicks.
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1938's version, starring Reginald Owen:
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A Christmas Carol (1954), starring Frederic March and Basil Rathbone:
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Here is An American Christmas Carol from 1979, starring Henry Winkler:
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From 2015, starring Anthony D.P. Mann, one of the shortest versions at 59 minutes:
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From the BBC in 2000, one of my favorite versions, set in modern London with Scrooge being a young hoodlum loan shark, starring Ross Kemp.
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And last, a musical version starring Albert Finney and Alec Guinness, Scrooge, from 1970.
Have fun, and remember the lesson the story tells so well!