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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 11 autographed thrillers (ends Jun 30, 18+).
BookReporter Best Books for Dad 2016
Win 5 novels & dad-themed treats (ends Jun 20).
BookReporter Word of Mouth Contest New contest
All Summer Long, Before the Fall, Modern Lovers (ends Jun 10).
Champagne and Cocaine Contest New contest
Win Richard Vetere's NY City novel (ends Jun 30, US, 18+).
Criminal Element Sweepstakes
Win crime fiction (ongoing).
Crown Publishing Read It Forward
Chance to win books (ongoing, US, 18+).
Free Book Friday
Chance to win every Friday (weekly, US & Can).
Fresh Fiction Contests
Win a variety of books (ongoing).
The Girl from The Savoy Contest New contest
Win Hazel Gaynor's post WW I historical (ends Jun 30, US, 18+).
Goodreads Giveaways
Win a variety of prerelease books.
Hachette Book Group USA Contests
Win a variety of books (ongoing).
Hell's Gate Contest New 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+).
The House of Secrets Contest New contest
Win Brad Meltzer's latest (ends Jun 23, US, 16+).
Marked for Life Contest New contest
Win the novel by Emelie Schepp (ends Jun 9).
Math Geek Contest New contest
Win the book on nerdiest math facts by Raphael Rosen (ends Jun 30, US, 18+).
Me Before You Contest New contest
Win 2 movie tickets & movie tie-in edition (ends Jun 20).
Myshelf.com 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
Win The Girls, Vinegar Girl audiobooks (ends Jul 1).
St. Martin's Read It First
Sign up, chance to win books (ongoing).
Susan Elizabeth Phillips Contests New contest
Win signed This Heart of Mine (ends Jun 30).
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 (ends Jun 5).
James Patterson Contests New contest
Win I Funny middle grade novel (ends Jun 15, US & Can, not Quebec, 13+).
TeenReads Beach Bag of Books 2016 New contest
Chance to win 6 YA novels (ends Aug 1, US & Can, not Quebec, 13+).