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Contests for Adults For Younger Readers

Bestsellersworld Giveaway New contest
David Baldacci's Long Road to Mercy (ends Nov 25, US, 16+).
Bestsellersworld Giveaway New contest
Man of War by Sean Parnell (ends Nov 25, US, 16+).
Bestsellersworld Giveaway New contest
Murder She Wrote: Manuscript for Murder (ends Dec 6, US, 16+).
Bookbitch Contests New contest
Chances to win 8 autographed thrillers (ends Nov 30, 18+).
BookReporter Word of Mouth Contest New contest
Long Road to Mercy, Past Tense (ends Nov 16).
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).
Goodreads Giveaways
Win a variety of prerelease books.
Grand Central L&S Brooklyn Cookbook Giveaway New contest
Win 3 heartwarming cookbooks (ends Nov 20, US).
History in Five Sweepstakes
Win a hardcover or signed edition book (monthly, 18+).
James Patterson Contests New contest
Chance to win The President is Missing (ends Nov 15, 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
Kingdom of the Blind, Master of His Fate audiobooks (ends Dec 3).
Susan Elizabeth Phillips Contests New contest
Win signed paperback Lady Be Good (ends Nov 30).
Tor Cory Doctorow Sweepstakes
Chance to win 5 signed books (US & CA).
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).