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Contests for Adults For Younger Readers

The Beach House: Coming Home Contest New contest
Win Georgia Bockoven's latest (ends May 31, US, 18+).
Becoming Bonnie Contest New contest
Win Jenni L. Walsh's historical novel (ends May 31, US & CA, not Quebec, 18+).
Bestsellersworld Giveaway New contest
Win Testimony by Scott Turow (ends May 25, US, 16+).
Bookbitch Contests New contest
Chances to win 8 autographed thrillers (ends May 31, 18+).
BookReporter Word of Mouth Contest New contest
Dragon Teeth & Testimony (ends May 26).
Criminal Element Sweepstakes
Win crime fiction (ongoing).
The Dinosaur Lords Giveaway New contest
Win Victor Milan's book (ends May 31, US & CA).
The Eye of the World Giveaway New contest
Win Robert Jordan's Wheel of Time #1 (ends May 30, US & CA).
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+).
I Can't Make This Up Giveaway New contest
Win an ARC of Kevin Hart's book (ends May 24, US, 18+).
James Patterson Contests New contest
Chance to win Cross Kill (ends May 17, US & CA, not Quebec, 13+).
Miss Burma Contest New contest
Win Charmaine Craig's historical novel. 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
Same Beach, Next Year, Since We Fell (ends Jun 1).
Susan Elizabeth Phillips Contests New contest
Win all 8 Chicago Stars books (ends May 31).
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).