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Contests for Adults For Younger Readers

The Atomic City Girls Contest New contest
Win Janet Beard's riveting historical (ends Feb 28, US, 18+).
Bestsellersworld Giveaway New contest
The Undertaker's Daughter by Sara Bladel (ends Feb 22, US, 16+).
Bestsellersworld Giveaway New contest
Win The Gate Keeper by Charles Todd (ends Feb 22, US, 16+).
Bookbitch Contests New contest
Chances to win 9 autographed thrillers (ends Feb 28, 18+).
BookReporter Books to Fall in Love With 2018 New contest
Chance to win 7 books & chocolates (ends Feb 14).
BookReporter Word of Mouth Contest New contest
The Great Alone, Look For Me (ends Feb 16).
Brett Battles BookSweeps New contest
Win eReader, 38 crime thrillers (ends Feb 12, 21+).
Criminal Element Sweepstakes
Win crime fiction (ongoing).
Crimson Lake Sweepstakes New contest
Win an ARC & audiobook download (ends Feb 25, US, 18+).
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 Private (ends Feb 9, US & CA, not Quebec, 13+). 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+).
Simon & Schuster Audiobook Sweepstakes New contest
Win gift cards, headphones, iPad mini, romance audiobooks (ends Feb 28, US, 18+).
Sounding Off on Audio Contest New contest
Educated: A Memoir, Surprise Me (ends Mar 1).
Susan Elizabeth Phillips Contests New contest
Win signed audiobook Heroes are My Weakness (ends Feb 28).
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 Final Six Contest New contest
Win Alexandra Monir's futuristic YA thriller (ends Feb 28, US, 18+).