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Contests for Adults For Younger Readers

After Midnight Authors Contest
Win a choice of romances (monthly).
Benefit of the Doubt Contest New contest
Win Neal Griffin's novel (ends Apr 15, US & CA).
Berkley Jove Contests
Fill in the form to win from a selection of books (monthly).
Bookbitch Contests
Chances to win 7 autographed thrillers (ends Apr 30, 18+).
BookReporter Contests
Win a variety of books each month.
BookReporter Word of Mouth Contests
At the Water's Edge, Patriot Threat, The Stranger (ends Apr 10).
Carla Neggers Contests
Win 2 signed books & gift card (ends Apr 30).
Criminal Element Sweepstakes
Win crime fiction (ongoing).
Crown Publishing Read It Forward
Chance to win books (ongoing, US, 18+).
Elizabeth Lowell Contests
Win Beautiful Sacrifice (ends Apr 30).
Fractured Contest New contest
Win Kate Watterson's new thriller (ends Apr 30, US, 18+).
Free Book Friday
Chance to win every Friday (weekly, US & Can).
Fresh Fiction Contests
Win a variety of books (ongoing).
Goodreads Giveaways
Win a variety of prerelease books.
Hachette Book Group USA Contests
Win a variety of books (ongoing).
Jayne Ann Krentz Contests
Win The Mystery Woman (ends Apr 30, US, 18+).
Myshelf.com Contest
Win books and audiobooks (ongoing).
Mystery Writers of America Cookbook Contest
Win the cookbook by bestselling authors (ends Apr 23, US, 18+).
NAL Authors Contests
Win from a selection of books (ongoing).
Nicole Jordan Contests
Legendary Lovers novel, earrings (ends Apr 30).
OnceWritten Contests
Lots of books, various genres (ongoing).
Prime Crime Contests
Win a selection of mysteries (ongoing, US, 18+).
Random House Competitions
Win books, trips, much more (ongoing, UK, 13+).
Reader Views Contests
Win a variety of books (ongoing, US & Can, 18+).
Seriously Wicked Contest New contest
Win Tina Connolly's fantasy (ends Apr 13, US & CA).
The Someday File Contest
Win the novel by Jean Heller (ends Apr 23, US, 18+).
St. Martin's Read It First
Sign up, chance to win books (ongoing).
Susan Elizabeth Phillips Contests
Win Heroes Are My Weakness unabridged audiobook (ends Apr 30).
When the Heavens Fall Contest New contest
Win Marc Turner's fantasy (ends Apr 20, US & CA).
Window Wall Contest New contest
Win Melanie Rawn's Glass Thorns #4 (ends Apr 30, US & Can, not Quebec, 18+).
Writerspace Contests
Win ebook readers, books, gift certificates, much more (ongoing).

For Younger Readers Contests for Adults
Don't Stay Up Late Contest
Win Ann Angel's anthology (ends Apr 20, US, 18+).
James Patterson Contests New contest
Win Maximum Ride: The Angel Experiment (ends Apr 22, US & Can, not Quebec, 13+).
A School for Unusual Girls Contest New contest
Stranje House #1 by Kathleen Baldwin (ends Apr 22, US & CA).
TeenReads Spring Fling New contest
Win 9 YA novels & tote bag (ends May 4, US, 18+).