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Contests for Adults For Younger Readers

All Out War Giveaway New contest
Win Sean Parnell's novel (ends Sep 22, US, 16+).
Bookbitch Contests New contest
Chances to win 9 autographed thrillers (ends Sep 30, 18+).
BookReporter Fall Preview 2019 New contest
Enter a series of 24-hour contests (ends Oct 31).
BookReporter Word of Mouth Contest New contest
The Testaments, Elevator Pitch (ends Sep 20).
Fresh Fiction Contests
Win a variety of books (ongoing).
Goodreads Giveaways
Win a variety of prerelease books.
James Patterson Contests
Win The 19th Christmas (ends Sep 12, US & CA, not Quebec, 13+).
Motherhood So White Giveaway New contest
Win Nefertiti Austin's memoir (ends Sep 19). Contest
Win books and audiobooks (ongoing, US).
The Program Giveaway New contest
Win Toni Natalie's book (ends Sep 22).
Read It Forward Giveaway
Weekly chances to win books (ongoing, US, 18+).
Reader Views Contests
Win a variety of books (ongoing, US & CA, 18+).
Reading Group Gold's Book Club Picks Sweepstakes New contest
Chance to win 5 books (ends Sep 22, US, 18+).
Sounding Off on Audio Contest New contest
The Institute, World That We Knew audiobooks (ends Oct 1).
Supernova Era Contest
Win an ARC of Cixin Lu's latest SF novel (ends Sep 4, US & CA, not Quebec, 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).