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Contests for Adults For Younger Readers

The Atwelle Confession Contest New contest
Chance to win Joel Gordonson's murder mystery (ends Sep 30, US, 18+).
Best Day Ever Contest New contest
Win Kaira Rouda's novel (ends Sep 21).
Bestsellersworld Giveaway New contest
Win Friend Request by Laura Marshall (ends Sep 24, US, 16+).
Bookbitch Contests New contest
Chances to win 11 autographed thrillers (ends Sep 30, 18+).
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 Michael Bennett: Bullseye (ends Sep 14, US & CA, not Quebec, 13+).
Keep Her Safe Contest New contest
Win Sophie Hannah's latest (ends Sep 24, US, 16+).
Law and Vengeance Contest New contest
Win Mike Papantonio's new legal thriller (ends Sep 30, US, 18+). 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 Cuban Affair, Sleeping Beauties (ends Oct 2).
Susan Elizabeth Phillips Contests New contest
Win Dream a Little Dream (ends Sep 30).
A Worldly Affair Contest New contest
Win Pamela Hanlon's account of NY & the UN (ends Sep 30, US, 18+).
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).