According to the Official Charts Company, the track crossed the milestone after selling 68,000 copies in 2013.
Mariah Carey wrote: “Thank you to all of my British fans! Love, Mariah.”
The Motown-inspired track peaked at number two when it was first released in 1994 but was kept off the top spot by East 17’s Stay Another Day.
It has since re-entered the chart on a further eight occasions.
Co-written and produced by Mariah Carey and Walter Afanasieff, the track first appeared on the festive album Merry Christmas and has generated an estimated $50 million in royalties worldwide since it was released.
All I Want For Christmas Is You returned to the Official Singles Chart in 2007, since when it has appeared in the top 40 every December.
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