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Contests for Adults For Younger Readers

After Midnight Authors Contest
Win a choice of romances (monthly).
Atonement Contest New contest
Win Beverly Lewis' novel (ends Apr 12).
Berkley Jove Contests
Fill in the form to win from a selection of books (monthly).
Blood Flag Contest New contest
Win Steve Martini's new thriller (ends Apr 30, US & Can, not Quebec, 18+).
Bookbitch Contests New contest
Chances to win 10 autographed thrillers (ends Apr 30, 18+).
BookReporter Spring Preview 2016 New contest
Win different title daily (ends Apr 21).
BookReporter Word of Mouth Contest New contest
Win 14th Colony, Miller's Valley, Lilac Girls (ends Apr 15).
Criminal Element Sweepstakes
Win crime fiction (ongoing).
Crown Publishing Read It Forward
Chance to win books (ongoing, 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).
James Patterson Contests New contest
Win a Truth or Die audiobook (ends Apr 20, US & Can, not Quebec, 13+).
The Last Mile Contest New contest
Win David Baldacci's latest (ends Apr 24, US, 16+).
Myshelf.com Contest
Win books and audiobooks (ongoing).
NAL Authors Contests
Win from a selection of books (ongoing).
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+).
Sounding Off on Audio Contest New contest
Win As Time Goes By, Glory Over Everything audiobooks (ends May 2).
St. Martin's Read It First
Sign up, chance to win books (ongoing).
Susan Elizabeth Phillips Contests New contest
Win signed Nobody's Baby But Mine (ends Apr 30).
War Hawk Contest New contest
Win James Rollins' new thriller (ends Apr 24, US, 16+).
Writerspace Contests
Win ebook readers, books, gift certificates, much more (ongoing).

For Younger Readers Contests for Adults
Me Before You and After You Contest New contest
Win 2 YA novels by Jojo Moyes (ends May 4, US & Can, 18+).
Nethergrim Duo Giveaway New contest
Win 2 Nethergrim novels (ends Apr 30, US & Can, not Quebec, 18+).
TeenReads Spring Fling 2016 New contest
Win 8 YA novels, tote bag (ends May 2, US & Can, 18+).