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Contests for Adults For Younger Readers

Bookbitch Contests New contest
Chances to win 5 autographed thrillers (ends Jan 31, 18+).
BookReporter End-of-the-Year Contest 2016 New contest
Chance to win 40 books (ends Jan 9).
BookReporter Word of Mouth Contest New contest
The Nowhere Man, Her Every Fear (ends Jan 20).
Criminal Element Sweepstakes
Win crime fiction (ongoing).
Free Book Friday
Chance to win every Friday (weekly, US & Can).
Fresh Fiction Contests
Win a variety of books (ongoing).
Garden of Lamentation Contest New contest
Win Deborah Crombie's latest (ends Jan 26, US, 16+).
Goodreads Giveaways
Win a variety of prerelease books.
History in Five Sweepstakes
Win a hardcover or signed edition book (monthly, 18+).
James Patterson Contests New contest
Bullseye by James Patterson & Michael Ledwidge (ends Jan 11, US & Can, not Quebec, 13+).
The Lost City of the Monkey God Contest New contest
Win Douglas Preston's novel (ends Jan 26, US, 16+).
Myshelf.com Contest
Win books and audiobooks (ongoing).
Penguin UK Competitions
Win books, trips, much more (ongoing, UK, 13+).
Read It Forward Goveaway New contest
Win 3 New Years audiobooks (ends Jan 11, US, 18+).
Reader Views Contests
Win a variety of books (ongoing, US & Can, 18+).
The River at Night Contest New contest
Win Erica Ferencik's thriller (ends Jan 31, US & Can, not Quebec, 18+).
Sounding Off on Audio Contest New contest
The Girl Before, The Sleepwalker (ends Feb 1).
Star Wars Celebration Sweeps New contest
Win a trip to April Orlando Star Wars celebration.
Susan Elizabeth Phillips Contests
Win First Star I See Tonight unabridged audio (ends Jan 31).
The Well Life Contest New contest
Win the book by Briana and Dr. Peter Borten (ends Jan 31, US & Can, not Quebec, 18+).
The Wild Harmonic Contest New contest
Win Beth W. Patterson's paranormal (ends Jan 31, US & Can, not Quebec, 18+).
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).