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Contests for Adults For Younger Readers

Back to School Audiobook Giveaway New contest
Win 3 school-themed audiobooks (ends Sep 1, US, 18+).
BookReporter Word of Mouth Contest New contest
Lightning Strike, A Slow Fire Burning (ends Sep 10).
Goodreads Giveaways
Win a variety of prerelease books.
James Patterson Contests New contest
Texas Outlaw softcover (ends Aug 26, US & CA, not QC, 13+).
Minotaur Signature Edition Sweepstakes New contest
Win complete set of Minotaur Signature Editions (ends Sep 6, US & CA, not QC, 13+).
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+).
Summer Reading 2021
Win books in series of 24 hour contests (ends Aug 31).
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).