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Contests for Adults For Younger Readers

Bookbitch Contests New contest
Chances to win 5 autographed thrillers (ends Feb 29, 18+).
BookReporter Word of Mouth Contest New contest
The Jetsetters, You are Not Alone (ends Mar 6).
Fresh Fiction Contests
Win a variety of books (ongoing).
Goodreads Giveaways
Win a variety of prerelease books.
Hachette Book Club Sweepstakes New contest
Win 10 months of Book Club reads (ends Feb 28, US, 18+).
James Patterson Contests New contest
Chance to win The Fall of Crazy House (ends Feb 28, US & CA, not Quebec, 13+).
The Last Tourist Giveaway
Q&A, chance to win The Last Tourist.
Myshelf.com Contest
Win books and audiobooks (ongoing, US).
Read It Forward Giveaway
Weekly chances to win books (ongoing, US, 18+).
Read to Sleep Giveaway New contest
Win a bedding set from Parachute & 25 books (ends Mar 31, US, 18+).
Reader Views Contests
Win a variety of books (ongoing, US & CA, 18+).
Sounding Off on Audio Contest New contest
Golden in Death, The Warsaw Protocol audiobooks (ends Mar 2).
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).