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Contests for Adults For Younger Readers

After Midnight Authors Contest
Win a choice of romances (monthly).
Berkley Jove Contests
Fill in the form to win from a selection of books (monthly).
Bookbitch Contests New contest
Chances to win 9 autographed thrillers (ends Jul 31, 18+).
BookReporter Word of Mouth Contest New contest
All the Missing Girls, First Comes Love (ends Jul 8).
Criminal Element Sweepstakes
Win crime fiction (ongoing).
Crown Publishing Read It Forward
Chance to win books (ongoing, US, 18+).
The Dinosaur Knights Contest New contest
Win Victor Milan's latest (ends Jul 31, US & Can, 18+).
Free Book Friday
Chance to win every Friday (weekly, US & Can).
Fresh Fiction Contests
Win a variety of books (ongoing).
Goodreads Giveaways
Win a variety of prerelease books.
Hachette Book Group USA Contests
Win a variety of books (ongoing).
Hell's Gate Contest
Win the novel by Bill Schutt & J. R. Finch (ends Jun 23, US, 16+).
History in Five Sweepstakes
Win a hardcover or signed edition book (monthly, 18+).
James Patterson Contests New contest
Chance to win Burn (ends Jul 13, US & Can, not Quebec, 13+). Contest
Win books and audiobooks (ongoing).
NAL Authors Contests
Win from a selection of books (ongoing).
OnceWritten Contests
Lots of books, various genres (ongoing).
Prime Crime Contests
Win a selection of mysteries (ongoing, US, 18+).
Random House Competitions
Win books, trips, much more (ongoing, UK, 13+).
Reader Views Contests
Win a variety of books (ongoing, US & Can, 18+).
Sounding Off on Audio Contest New contest
All is Not Forgotten, They May Not Mean to, But They Do (ends Aug 1).
St. Martin's Read It First
Sign up, chance to win books (ongoing).
Susan Elizabeth Phillips Contests New contest
Win signed Match Me If You Can (ends Jul 31).
The Weaver's Lament Contest New contest
Win Elizabeth Haydon's Symphony of Ages #9 (ends Jul 31, US & Can, 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).
TeenReads Beach Bag of Books 2016 New contest
Chance to win 6 YA novels (ends Aug 1, US & Can, not Quebec, 13+).