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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
Chances to win 6 autographed thrillers (ends Aug 31, 18+).
BookReporter Summer Reading 2016 New contest
Win different books on select days through August (ends Aug 31).
BookReporter Word of Mouth Contest New contest
A House Without Windows, Sting (ends Aug 19).
Cork O'Connor Giveaway New contest
Win 15 books by William Kent Krueger (ends Aug 25).
Criminal Element Sweepstakes
Win crime fiction (ongoing).
Crown Publishing Read It Forward
Chance to win books (ongoing, US, 18+).
Death's End Contest New contest
Win Liu Cixin's SF novel (ends Aug 24, US & Can).
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).
History in Five Sweepstakes
Win a hardcover or signed edition book (monthly, 18+).
James Patterson Contests New contest
Chance to win Mistress (ends Aug 16, US & Can, not Quebec, 13+).
The Little Old Lady Who Broke All the Rules Contest New contest
Win Catharina Ingelman-Sundberg's hilarious romp (ends Aug 31, US, 18+). Contest
Win books and audiobooks (ongoing).
NAL Authors Contests
Win from a selection of books (ongoing).
The New Trail of Tears Contest New contest
Win Naomi Schaefer Riley's thought provoking book (ends Aug 31, US, Can, 18+).
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+).
The Shattered Tree Contest New contest
Win Charles Todd's latest (ends Aug 22, US, 16+).
Sounding Off on Audio Contest New contest
Behold the Dreamers, The Dollhouse (ends Sep 6).
St. Martin's Read It First
Sign up, chance to win books (ongoing).
Sting Contest New contest
Win Sandra Brown's latest (ends Aug 22, US, 16+).
Stranded Contest New contest
Win Bracken MacLeod's thriller (ends Aug 31, US & Can).
Susan Elizabeth Phillips Contests
Win signed Natural Born Charmer (ends Aug 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).
Metaltown Contest New contest
Win Kristen Simmons' new YA novel (ends Aug 16, US & Can).
Vassa in the Night Contest New contest
Win Sarah Porter's YA novel (ends Aug 23, US & Can).