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Contests for Adults For Younger Readers

Bestsellersworld Giveaway New contest
The Escape Artist by Brad Meltzer (ends Mar 25, US, 16+).
Bestsellersworld Giveaway New contest
Win The Wild Inside by James Bradbury (ends Mar 25, US, 16+).
Bookbitch Contests New contest
Chances to win 8 autographed thrillers (ends Mar 31, 18+).
BookReporter Word of Mouth Contest New contest
Win The Escape Artist, Let Me Lie (ends Mar 16).
Criminal Element Sweepstakes
Win crime fiction (ongoing).
Free Book Friday
Chance to win every Friday (weekly, US & CA).
Fresh Fiction Contests
Win a variety of books (ongoing).
Goodreads Giveaways
Win a variety of prerelease books.
Greatest Love Contest New contest
Win Dr. & Master Zhi Gang Sha's book (ends Mar 31, US, 18+).
History in Five Sweepstakes
Win a hardcover or signed edition book (monthly, 18+). Contest
Win books and audiobooks (ongoing).
Penguin UK Competitions
Win books, trips, much more (ongoing, UK, 13+).
Read It Forward Giveaway
Weekly chances to win books (ongoing, US, 18+).
Reader Views Contests
Win a variety of books (ongoing, US & CA, 18+).
Savage Liberty Contest New contest
Win Eliot Pattison's historical mystery (ends Mar 31, US & CA, not Quebec, 18+).
Sounding Off on Audio Contest New contest
Duel to the Death, Every Note Played (ends Apr 2).
Susan Elizabeth Phillips Contests New contest
Win signed hardcover The Great Escape (ends Mar 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).
James Patterson Contests New contest
Win Middle School: Escape to Australia! (ends Mar 9, US & CA, not Quebec, 13+).