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Contests for Adults For Younger Readers

BookReporter Holiday Cheer New contest
Check daily for a series of 24 hour contests (ends Dec 31).
BookReporter Word of Mouth Contest New contest
Dark Tides, No Time Like the Future (ends Dec 4).
Goodreads Giveaways
Win a variety of prerelease books.
James Patterson Contests New contest
Chance to win NYPD RED 6 (ends Dec 4, US & CA, not Quebec, 13+).
My Brilliant Life Sweepstakes New contest
Win an ARC of Ae-ran Kim's novel (ends Dec 6, US & CA, not Quebec, 18+).
Myshelf.com Contest
Win books and audiobooks (ongoing, US).
Read It Forward Giveaway
Weekly chances to win books (ongoing, US, 18+).
Reader Views Contests
Win a variety of books (ongoing, US & CA, 18+).
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).