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Contests for Adults For Younger Readers

Bookbitch Contests New contest
Chances to win 10 autographed thrillers (ends Mar 31, 18+).
BookReporter Word of Mouth Contest New contest
The Last Odyssey, Devoted (ends Apr 3).
Fresh Fiction Contests
Win a variety of books (ongoing).
Goodreads Giveaways
Win a variety of prerelease books.
James Patterson Contests New contest
Chance to win The Inn (ends Mar 27, 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+).
Reader Views Contests
Win a variety of books (ongoing, US & CA, 18+).
Sandie Jones Collection Sweepstakes New contest
Win 3 books & 3 signed bookplates (ends Mar 29, US, 18+).
Sounding Off on Audio Contest New contest
My Dark Vanessa, The Night Watchman audiobooks (ends Apr 1).
To Sleep in a Sea of Stars Giveaway New contest
Win a partial galley (ends Mar 24, US).
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).