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Contests for Adults For Younger Readers

BookReporter Word of Mouth Contest New contest
The Answer Is..., Florence Adler Swims Forever (ends Jul 31).
The Crushing Depths Contest New contest
Win Coastal Guardians #2 (ends Jul 21).
Goodreads Giveaways
Win a variety of prerelease books.
James Patterson Contests New contest
Chance to win CRISS CROSS (ends Jul 23, US & CA, not Quebec, 13+).
Myshelf.com Contest
Win books and audiobooks (ongoing, US).
Paolini Sweeps New contest
To Sleep in a Sea of Stars prize box (ends Sep 14, US & CA, not Quebec, 18+).
Read It Forward Giveaway
Weekly chances to win books (ongoing, US, 18+).
Reader Views Contests
Win a variety of books (ongoing, US & CA, 18+).
Sounding Off on Audio Contest New contest
Near Dark, The Book of Lost Names audiobooks (ends Aug 3).
Summer Reading 2020
Check daily for 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).