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Contests for Adults For Younger Readers

Bestsellersworld Giveaway New contest
Win 16th Seduction by James Patterson (ends Dec 29, US, 16+).
Bestsellersworld Giveaway New contest
James Rollins' The Demon Crown (ends Dec 29, US, 16+).
Bestsellersworld Giveaway New contest
Jon Land's Strong to the Bone (ends Dec 29, US, 16+).
Bookbitch Contests New contest
Chances to win 5 autographed thrillers (ends Dec 31, 18+).
BookReporter Holiday Cheer 2017 New contest
Different prizes through Nov/Dec (ends Dec 31).
BookReporter Word of Mouth Contest New contest
Demon Crown, Enchantress of Numbers (ends Dec 15).
Criminal Element Sweepstakes
Win crime fiction (ongoing).
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+).
Holiday Cookbook Giveaway New contest
Hot Mess Kitchen, Culinary Bro-Down Cookbook (ends Dec 15, US, 18+).
Hymn Contest New contest
Ken Scholes' Psalms of Isaak #5 (ends Dec 31, US, 18+).
I Know My Name Giveaway New contest
Chance to win C.J. Cooke's novel (ends Dec 31, US & CA).
James Patterson Contests New contest
Chance to win The Games (ends Dec 14, US & CA, not Quebec, 13+).
Moon Hunt Contest New contest
Morning Star #3 by the Gears (ends Dec 31, US & CA, not Quebec, 18+). Contest
Win books and audiobooks (ongoing).
Oathbringer Contest New contest
Win Brandon Sanderson's Oathbringer: Stormlight Archives #3 (ends Dec 31, US & CA, not Quebec, 18+).
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+).
Sounding Off on Audio Contest New contest
Sing, Unburied, Sing, Uncommon Type (ends Jan 2).
Susan Elizabeth Phillips Contests
Win autographed First Star I See Tonight (ends Dec 31).
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).
Seriously Hexed Contest New contest
Tina Connolly's Seriously Wicked #3 (ends Dec 31, US & CA, not Quebec, 18+).