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Contests for Adults For Younger Readers

BookReporter Fall Preview 2020 New contest
Series of 24 hour contests - 12 books to be won (ends Oct 31).
BookReporter Word of Mouth Contest New contest
Confessions on the 7:45, The End of the Day (ends Oct 9).
Goodreads Giveaways
Win a variety of prerelease books.
James Patterson Contests New contest
Chance to win Three Women Disappear (ends Oct 1, US & CA, not Quebec, 13+).
Make Your Own Ren Faire Sweepstakes New contest
Win Lionhearts, Nottingham, more (ends Oct 4, 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).