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Contests for Adults For Younger Readers

Alzheimer's Journey Contest New contest
Creating Moments of Joy Along the Alzheimer's Journey (ends Jan 31, US, 18+).
Bestsellersworld Giveaway New contest
Win Sunday Silence by Nicci French (ends Jan 22, US, 16+).
Bestsellersworld Giveaway New contest
City of Endless Night by Douglas Preston, Lincoln Child (ends Jan 22, US, 16+).
Bookbitch Contests New contest
Chances to win 8 autographed thrillers (ends Jan 31, 18+).
BookReporter Books to Fall in Love With 2018 New contest
Chance to win 7 books & chocolates (ends Feb 14).
BookReporter Sneak Peek Giveaway New contest
ARC of Emmanuelle de Villepin's The Devil's Reward (ends Jan 18).
BookReporter Word of Mouth Contest New contest
Carnegie's Maid, The Immortalists (ends Jan 19).
The Bookworm Contest New contest
Win Mitch Silver's intriguing thriller (ends Jan 31, US, 18+).
Bora Bora Winter Escape New contest
Win the trip to Tahiti & a collection of beach reads (ends Jan 31, US, 18+).
Criminal Element Sweepstakes
Win crime fiction (ongoing).
The Firemaker Contest New contest
Win Peter May's brilliant China thriller (ends Jan 31, US & CA, not Quebec, 18+).
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+).
James Patterson Contests New contest
Chance to win Haunted (ends Jan 19, US & CA, not Quebec, 13+).
Myshelf.com Contest
Win books and audiobooks (ongoing).
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+).
Sounding Off on Audio Contest New contest
The English Wife, The Wife Between Us (ends Feb 1).
Susan Elizabeth Phillips Contests
Win autographed First Star I See Tonight (ends Jan 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).