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Contests for Adults For Younger Readers

The Affinities Contest
Win Robert Charles Wilson's latest (ends Mar 23, US & Can).
After Midnight Authors Contest
Win a choice of romances (monthly).
Berkley Jove Contests
Fill in the form to win from a selection of books (monthly).
Bookbitch Contests
Chances to win 9 autographed thrillers (ends Mar 31, 18+).
BookReporter Contests
Win a variety of books each month.
BookReporter Word of Mouth Contests New contest
Dead Wake, Last One Home, World Gone By (ends Mar 20).
Carla Neggers Contests
Win signed The Carriage House (ends Mar 31).
Child 44 Contest
Win Tom Rob Smith's thriller (ends Mar 22, US, 18+).
Criminal Element Sweepstakes
Win crime fiction (ongoing).
Crown Publishing Read It Forward
Chance to win books (ongoing, US, 18+).
Elizabeth Lowell Contests
Win signed Innocent as Sin (ends Mar 31).
Ellie's Story Contest
Win W. Bruce Cameron's book (ends Mar 17, US & Can).
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).
Inside a Silver Box Contest New contest
Win Walter Mosley's new SF novel (ends Mar 31, US & Can, not Quebec, 18+).
James Patterson Contests
Win NYPD Red 2 (ends Mar 11, US & Can, not Quebec, 13+).
Jayne Ann Krentz Contests
Win The Hot Zone (ends Mar 31, US, 18+).
The Kind Worth Killing Contest New contest
Win Peter Swanson's new thriller (ends Mar 31, US, 18+).
The Kind Worth Killing Contest
Win Peter Swanson's thriller (ends Mar 8, US, 18+).
The Lost Boys Symphony Contest
Win the novel by Mark Ferguson (ends Mar 22, US, 18+).
The Machine Awakes Contest
Win Adam Christopher's Spider Wars #2 (ends Mar 24, US & Can).
Myshelf.com Contest
Win books and audiobooks (ongoing).
NAL Authors Contests
Win from a selection of books (ongoing).
Nicole Jordan Contests
Legendary Lovers novel, earrings (ends Mar 31).
Of Noble Family Contest
Win Mary Robinette Kowal's latest (ends Mar 30, US & Can).
OnceWritten Contests
Lots of books, various genres (ongoing).
The Pilgrims Contest New contest
Win Will Elliott’s The Pendulum #1 (ends Mar 31, US & Can, not Quebec, 18+).
Pirate's Alley Contest
Win Sentinels of New Orleans #4 (ends Mar 26, US & Can).
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+).
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 Mar 31).
The Unremembered Contest
Win Peter Orullian's fantasy (ends Mar 13, US & Can).
Writerspace Contests
Win ebook readers, books, gift certificates, much more (ongoing).

For Younger Readers Contests for Adults
Shadow Scale Contest New contest
Win Rachel Hartman's sequel to Seraphina (ends Mar 31, US, 18+).
Things I'll Never Say Contest
Win Ann Angel's anthology (ends Mar 17, US, 18+).
Why'd They Wear That? Contest
Win Sarah Albee's hilarious book (ends Mar 10, US, 18+).
Zest Juicy Reads of the Month Contest
Win a High School Prize Pack (3 books) (ends Mar 31, US & Can).