Merry Christmas, for those who celebrate it! Here, in no particular order, are some old, beloved middle-grade fantasy books for Christmas. All except for Wintersmith are ones that I reread every year as a child.
Father Christmas Letters by J.R.R. Tolkien. These are the letters that Tolkien’s children got from Father Christmas, complete with colored illustrations of Father Christmas, his assistant the North Polar Bear, and the elves and goblins they have adventures with.
Wintersmith by Terry Pratchett. It’s maybe not a classic quite yet, and maybe also not properly Christmas… but it certainly suits the season. Young Tiffany Aching, witch in training, accidentally attracts the attention of the Spirit of Winter and has to put things right again.