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Contests for Adults For Younger Readers

Ball Lightning Contest
Win the book by Liu Cixin (ends Jul 15, US & CA).
Bestsellersworld Giveaway New contest
Win Sheena Kamal's All Falls Down (ends Jul 26, US, 16+).
Bestsellersworld Giveaway New contest
Watch the Girls by Jennifer Wolfe (ends Jul 26, US, 16+).
Bookbitch Contests
Chances to win 7 autographed thrillers (ends Jul 31, 18+).
BookReporter Summer Reading 2018 New contest
24-hour contests through the summer (ends Aug 24).
BookReporter Word of Mouth Contest New contest
Clock Dance, Give Me Your Hand (ends Jul 20).
Criminal Element Sweepstakes
Win crime fiction (ongoing).
Day of the Dead Contest New contest
Win Nicci French's latest thriller (ends Jul 31, US, 18+).
Dead If You Don't Contest New contest
Win Peter James' new Roy Grace mystery (ends Jul 31, US, 18+).
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+).
Myshelf.com Contest
Win books and audiobooks (ongoing).
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
Believe Me, Cottage by the Sea (ends Aug 1).
Superhero Ethics Contest New contest
Travis Smith's book on '10 Ways to Save the World' (ends Jul 31, US, 18+).
Susan Elizabeth Phillips Contests
Win signed hardcover The Great Escape (ends Jul 31).
Tor Cory Doctorow Sweepstakes
Chance to win 5 signed books (US & CA).
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).
James Patterson Contests
Chance to win How to Be a Supervillain (ends Jul 5, US & CA, not Quebec, 13+).
TeenReads Beach Bag of Books 2018
Chance to win 10 great beach reads (ends Jul 9, US & CA, 13+).