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Contests for Adults For Younger Readers

Book Riot Giveaways
Variety of book contests (ongoing).
BookReporter Word of Mouth Contest New contest
Exiles, The Shards, Stella Maris (ends Feb 3).
Contest Canada
Win Canadian cookbooks (ongoing, Can, 18+).
Goodreads Giveaways
Win a variety of prerelease books.
James Patterson Contests
Chance to win Roses are Red (ends Jan 19, US & CA, not QC, 13+).
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).
Riveted by Simon Teen
Chance to win YA books (ongoing).