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Contests for Adults For Younger Readers

Bestsellersworld Giveaway
Win No Surrender by Patrick Bisher with Jon Land (ends Aug 28, US, 16+).
The Black Kachina Contest New contest
Win Jack Getze's thriller (ends Aug 24, US, 16+).
The Black Kachina Contest New contest
Win Jack Getze's thriller (ends Aug 31, US, 18+).
Bookbitch Contests
Chances to win 10 autographed thrillers (ends Aug 31, 18+).
BookReporter Summer Reading 2017
Different titles to win all summer (ends Aug 24).
BookReporter Word of Mouth Contest
The Good Daughter & A Stranger in the House (ends Aug 18).
Criminal Element Sweepstakes
Win crime fiction (ongoing).
Fatal Trust Contest New contest
Win Todd M. Johnson's novel (ends Aug 17).
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.
History in Five Sweepstakes
Win a hardcover or signed edition book (monthly, 18+).
Knopf Doubleday Sweeps New contest
Chance to win 7 LA beach reads (ends Aug 22, US, 18+).
The Lost Ones Contest New contest
Win Sheena Kamal's novel (ends Aug 24, US, 16+). Contest
Win books and audiobooks (ongoing).
National Sister's Day Giveaway New contest
The Last Chance Matinee, The Mirror Sisters (ends Aug 31, US, 18+).
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+).
Seeing Red Giveaway New contest
Win Sandra Brown's latest (ends Aug 24, US, 16+).
Sounding Off on Audio Contest New contest
Emma in the Night, Glass Houses (ends Sep 6).
Susan Elizabeth Phillips Contests
Win Nobody's Baby but Mine (ends Aug 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
Middle School: The Worst Years of My Life! (ends Aug 16, US & CA, not Quebec, 13+).