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Contests for Adults For Younger Readers

BookReporter Spring Preview 2021 New contest
Enter series of 24 hour contests (ends Apr 23).
BookReporter Word of Mouth Contest New contest
Mother May I, When the Stars Go Dark (ends Apr 16).
Goodreads Giveaways
Win a variety of prerelease books.
James Patterson Contests New contest
Win Walk in My Combat Boots (ends Apr 15, US & CA, not Quebec, 13+).
Myshelf.com Contest
Win books and audiobooks (ongoing, US).
The New Age of Empire Sweepstakes New contest
Win Kehinde Andrews's hardcover (US, 18+).
Read It Forward Giveaway
Weekly chances to win books (ongoing, US, 18+).
Reader Views Contests
Win a variety of books (ongoing, US & CA, 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).
The Ulti-Mutt Dog Diaries Sweepstakes New contest
Win all 5 paw-some books (ends Apr 30, US, 18+).