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Contests for Adults For Younger Readers

The 7th Plague Contest New contest
Win James Rollins' latest (ends Dec 13, US, 16+).
Bookbitch Contests
Chances to win 6 autographed thrillers (ends Dec 31, 18+).
Bookreporter Holiday Cheer 2016 New contest
Contests to win books - check daily Nov/Dec (ends Dec 31).
BookReporter Word of Mouth Contest New contest
The Princess Diarist, No Man's Land (ends Dec 2).
Criminal Element Sweepstakes
Win crime fiction (ongoing).
Empire Games Contest New contest
Win Charles Stross's new series opener (ends Dec 5, US & Can).
The Flame Bearer Contest New contest
Win Bernard Cornwell's 10th Saxon Tale (ends Dec 31, US & Can, not Quebec, 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.
History in Five Sweepstakes
Win a hardcover or signed edition book (monthly, 18+).
How Will I Know You? Contest New contest
Win Jessica Treadway's novel (ends Dec 13, US, 16+).
James Patterson Contests New contest
Chance to win 15th Affair (ends Dec 7, US & Can, not Quebec, 13+).
Law and Disorder Contest New contest
Win Mike Papantonio's new legal thriller (ends Dec 31, US & Can, not Quebec, 18+).
Myshelf.com Contest
Win books and audiobooks (ongoing).
Penguin UK Competitions
Win books, trips, much more (ongoing, UK, 13+).
Prince Lestat Sweepstakes New contest
Win Anne Rice's latest (ends Dec 7, US, 18+).
Read It Forward Goveaway New contest
Win 50 books + bookshelf (ends Dec 27, US, 18+).
Reader Views Contests
Win a variety of books (ongoing, US & Can, 18+).
Sounding Off on Audio Contest New contest
Faithful, Sleeping Beauty Killer (ends Jan 3).
Susan Elizabeth Phillips Contests
Win First Star I See Tonight unabridged audio (ends Dec 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).
The Rains Contest New contest
Win Gregg Hurwitz's stunning YA series opener (ends Dec 31, US & Can, not Quebec, 18+).
TeenReads Holiday Bundle of Cheer 2016 New contest
Win 7 great YA novels & festive goodies (ends Dec 21, US & Can, not Quebec, 13+).