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Contests for Adults For Younger Readers

Bookbitch Contests New contest
Chances to win 10 autographed thrillers (ends May 30, 18+).
BookReporter Word of Mouth Contest New contest
Hideaway, Hollywood Park (ends May 29).
Fresh Fiction Contests
Win a variety of books (ongoing).
Goodreads Giveaways
Win a variety of prerelease books.
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+).
Sounding Off on Audio Contest New contest
Fair Warning, The Last Trial audiobooks (ends Jun 1).
Summer of Mystery Sweepstakes New contest
Win new novels by James Patterson, Elin Hildebrand (ends Jun 8, US, 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).
James Patterson Contests
Chance to win Hawk (ends May 15, US & CA, not Quebec, 13+).