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Contests for Adults For Younger Readers

Alex Cross Sweepstakes New contest
Win all 29 books in the series (ends Nov 22, US, 18+).
BookReporter Word of Mouth Contest New contest
The Dark Hours, The Sentence (ends Nov 19).
Goodreads Giveaways
Win a variety of prerelease books.
James Patterson Contests New contest
Chance to win Walk in My Combat Boots (ends Nov 11, US & CA, not QC, 13+).
Myshelf.com Contest
Win books and audiobooks (ongoing, US).
Olga Dies Dreaming Giveaway New contest
Win the novel by by Xochitl Gonzalez (ends Nov 19).
Reader Views Contests
Win a variety of books (ongoing, US & CA, 18+).
T. Jefferson Parker Sweepstakes New contest
Chance to win A Thousand Steps ARC (ends Nov 16, US & CA, not QC, 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).