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Contests for Adults For Younger Readers

After Midnight Authors Contest
Win a choice of romances (monthly).
Back to School Sweepstakes New contest
Win 3 fun self improvement books (ends Sep 30, US, 18+).
Berkley Jove Contests
Fill in the form to win from a selection of books (monthly).
Bookbitch Contests
Chances to win 3 autographed thrillers (ends Sep 30, 18+).
BookReporter Word of Mouth Contest
The Couple Next Door, A Gentleman in Moscow (ends Sep 9).
Bury the Living Contest New contest
Win Jodi McIsaac's time travel novel (ends Sep 30, US & Can, not Quebec, 18+).
Closed Casket Contest New contest
Win Sophie Hannah's latest (ends Sep 22, US, 16+).
Criminal Element Sweepstakes
Win crime fiction (ongoing).
Crown Publishing Read It Forward
Chance to win books (ongoing, US, 18+).
Edgar Allan Poe Contest New contest
Win Odessa Begay's adult coloring book (ends Sep 30, 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.
Hachette Book Group USA Contests
Win a variety of books (ongoing).
History in Five Sweepstakes
Win a hardcover or signed edition book (monthly, 18+).
Junk Gypsy Contest New contest
Pre-order, chance to win trip to Texas (ends Oct 3, US, 18+).
Myshelf.com Contest
Win books and audiobooks (ongoing).
NAL Authors Contests
Win from a selection of books (ongoing).
OnceWritten Contests
Lots of books, various genres (ongoing).
Orbit Loot Contest New contest
Chance to win Forsaken Skies (US, 18+).
The Orphan Mother Contest New contest
Win Robert Hicks' novel (ends Sep 22, US, 16+).
Prime Crime Contests
Win a selection of mysteries (ongoing, US, 18+).
Random House Competitions
Win books, trips, much more (ongoing, UK, 13+).
Razor Girl Contest New contest
Win a signed copy of Carl Hiaasen's latest (ends Sep 12, US, 18+).
Reader Views Contests
Win a variety of books (ongoing, US & Can, 18+).
The Seed Apple Contest New contest
Win Sheldon Greene's novel (ends Sep 30, US & Can, not Quebec, 18+).
Sounding Off on Audio Contest New contest
Closed Casket, Commonwealth (ends Oct 3).
Spellbreaker Contest New contest
Win Blake Charlton's Spellwright #3 (ends Sep 30, US & Can, not Quebec, 18+).
St. Martin's Read It First
Sign up, chance to win books (ongoing).
Susan Elizabeth Phillips Contests
Win signed First Star I See Tonight (ends Sep 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).
James Patterson Contests New contest
Win Middle School: The Worst Years of My Life (ends Sep 21, US & Can, not Quebec, 13+).
Treasure Hunters Secret Hideout Contest New contest
Chance to win $10,000 (ends Oct 4, US, 8-17).