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Contests for Adults For Younger Readers

31 Days of Pie Giveaway New contest
Chance to win 21 books (ends Dec 31).
Bestsellersworld Giveaway
Murder She Wrote: Manuscript for Murder (ends Dec 6, US, 16+).
Bestsellersworld Giveaway New contest
Sarah Bailey's Into the Night (ends Dec 19, US, 16+).
Bestsellersworld Giveaway New contest
Shell Game by Sara Paretsky (ends Dec 18, US, 16+).
Bookbitch Contests New contest
Chances to win 10 autographed thrillers (ends Dec 31, 18+).
BookReporter Word of Mouth Contest New contest
A Christmas Revelation, You Don't Own Me (ends Dec 14).
Fresh Fiction Contests
Win a variety of books (ongoing).
Goodreads Giveaways
Win a variety of prerelease books.
James Patterson Contests New contest
Chance to win 96 Words for Love (ends Dec 6, US & CA, not Quebec, 13+).
Myshelf.com Contest
Win books and audiobooks (ongoing).
Read It Forward Giveaway
Weekly chances to win books (ongoing, US, 18+).
Reader Views Contests
Win a variety of books (ongoing, US & CA, 18+).
Ruin of Kings Goodie Box Sweepstakes New contest
Win the galley, pint glass, more (ends Dec 7, US & CA, not Quebec).
Sounding Off on Audio Contest New contest
Once Upon a River, Watching You audiobooks (ends Jan 2).
Susan Elizabeth Phillips Contests New contest
Win unabridged audio Heroes are My Weakness (ends Dec 31).
Tor Cory Doctorow Sweepstakes
Chance to win 5 signed books (US & CA).
Writerspace Contests
Win ebook readers, books, gift certificates, much more (ongoing).

For Younger Readers Contests for Adults
Epic Reads Contests
Win ARCs of various YA novels (ongoing).