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Contests for Adults For Younger Readers

12 Authors Reading New contest
Sign up, chance to win 12 novels (ends Nov 30, US, 18+).
Bestsellersworld Giveaway
Agatha Christie's Murder on the Orient Express (ends Nov 26, US, 16+).
Bestsellersworld Giveaway
Win End Game by David Baldacci (ends Nov 26, US, 16+).
Bookbitch Contests
Chances to win 2 autographed thrillers (ends Nov 30, 18+).
BookReporter Holiday Cheer 2017 New contest
Different prizes through Nov/Dec (ends Dec 31).
BookReporter Word of Mouth Contest New contest
Story of Arthur Truluv, The Whispering Room (ends Dec 1).
Criminal Element Sweepstakes
Win crime fiction (ongoing).
Free Book Friday
Chance to win every Friday (weekly, US & CA).
Fresh Fiction Contests
Win a variety of books (ongoing).
The Girl in the Tower Contest New contest
Win the 2nd in Katherine Arden's trilogy (ends Nov 30, US, 18+).
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 Filthy Rich (ends Nov 23, US & CA, not Quebec, 13+).
Myshelf.com Contest
Win books and audiobooks (ongoing).
A Parent's Guide to Teen Addiction Contest New contest
Win the book by by Laurence Westreich, M.D. (ends Nov 30, US, 18+).
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+).
Shakedown Contest New contest
Chance to win Martin Bodenham's financial thriller (ends Nov 30, US, 18+).
Sounding Off on Audio Contest New contest
Every Breath You Take, It's All Relative (ends Dec 1).
Susan Elizabeth Phillips Contests
Win First Star I See Tonight (ends Nov 30).
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).
Simon & Schuster Read & Play Giveaway New contest
Library of children's books, Cook 'N Learn Smart Kitchen (ends Nov 30, US, 18+).