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Contests for Adults For Younger Readers

Bookbitch Contests New contest
Chances to win 7 autographed thrillers (ends Jan 31, 18+).
BookReporter Word of Mouth Contest New contest
American Dirt, A Long Petal of the Sea (ends Jan 24).
Fresh Fiction Contests
Win a variety of books (ongoing).
The Glass Hotel Giveaway
Win ARC of Emily St. John Mandel's latest (ends Jan 21, US, 18+).
Goodreads Giveaways
Win a variety of prerelease books. Contest
Win books and audiobooks (ongoing, US).
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
Long Bright River, House on Fire audiobooks (ends Feb 3).
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).
James Patterson Contests New contest
Chance to win Girls of Storm and Shadow (ends Jan 17, US & CA, not Quebec, 13+).