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Contests for Adults For Younger Readers

Bestsellersworld Giveaway New contest
David Carlson's Let These Bones Live Again (ends Oct 24, US, 16+).
Bestsellersworld Giveaway New contest
November Road by Lou Berney (ends Oct 24, US, 16+).
Bestsellersworld Giveaway New contest
Jeff Abbott's The Three Beths (ends Oct 24, US, 16+).
Bookbitch Contests New contest
Chances to win 10 autographed thrillers (ends Oct 31, 18+).
Bookreporter Contest New contest
Win Marie Benedict's The Only Woman in the Room (ends Oct 18).
BookReporter Word of Mouth Contest New contest
Every Breath, Winter in Paradise (ends Oct 19).
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.
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 Oct 11, US & CA, not Quebec, 13+). 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+).
The Ruin of Kings Sweepstakes New contest
Chance to win Jenn Lyons' epic fantasy The Ruin of Kings (ends Oct 12, US, 18+).
Sounding Off on Audio Contest New contest
Unsheltered, Next Person You Meet in Heaven audiobooks (ends Nov 1).
Susan Elizabeth Phillips Contests New contest
Win signed paperback Fancy Pants (ends Oct 31).
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).