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Contests for Adults For Younger Readers

Bestsellersworld Giveaway New contest
Blood Relations by Edward & Kathy Cohen (ends Mar 21, US, 16+).
Bestsellersworld Giveaway New contest
Before She Knew Him by Peter Swanson (ends Mar 21, US, 16+).
Bestsellersworld Giveaway New contest
Run Away by Harlan Koben (ends Mar 21, US, 16+).
Bookbitch Contests New contest
Chances to win 10 autographed thrillers (ends Mar 31, 18+).
BookReporter Word of Mouth Contest New contest
Island of Sea Women, Malta Exchange (ends Mar 15).
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 Filthy Rich (ends Mar 7, US & CA, not Quebec, 13+).
Myshelf.com Contest
Win books and audiobooks (ongoing).
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
Cemetery Road, Crucible audiobooks (ends Apr 1).
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).