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Contests for Adults For Younger Readers

BookReporter End-of-the-Year Contest 2020 New contest
Chance to win 42 books (ends Jan 4, 2020).
BookReporter Word of Mouth Contest New contest
Last Days of John Lennon, Wealth of Pigeons (ends Dec 18, 2020).
Goodreads Giveaways
Win a variety of prerelease books.
Hidden Treasure Sweepstakes New contest
Leave a comment, chance to win the book (ends Dec 18, 2020, US & CA, not Quebec, 18+).
Home for the Holidays Giveaway New contest
Win books, subscription to Imbibe, holiday goodies (ends Dec 16, 2020, US, 21+).
James Patterson Contests New contest
Chance to win Unsolved (ends Dec 18, 2020, US & CA, not Quebec, 13+).
Myshelf.com Contest
Win books and audiobooks (ongoing, US).
New Reads for the New Year Sweepstakes New contest
Chance to win a pair of books (ends Dec 24, 2020, 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).