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Contests for Adults For Younger Readers

An Outlaw Makes It Home Contest New contest
Win Eli Jaxon-Bear's engrossing memoir/travelogue (ends Aug 31, US, 18+).
Bestsellersworld Giveaway New contest
The Mystery of Three Quarters by Sophie Hannah (ends Aug 24, US, 16+).
Bestsellersworld Giveaway New contest
Win Sandra Brown's Tailspin (ends Aug 24, US, 16+).
Bookbitch Contests New contest
Chances to win 13 autographed thrillers (ends Aug 31, 18+).
Bookreporter Contest New contest
Win Jen Turano's Caught by Surprise: Apart from the Crowd #3 (ends Aug 14).
BookReporter Summer Reading 2018
24-hour contests through the summer (ends Aug 24).
BookReporter Word of Mouth Contest New contest
Tailspin, An Unwanted Guest (ends Aug 17).
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+).
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
Gathering of Secrets, I See Life Through Rosé-Colored Glasses (ends Sep 4).
Susan Elizabeth Phillips Contests New contest
Win signed paperback First Star I See Tonight (ends Aug 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 New contest
Chance to win Girls of Paper and Fire (ends Aug 9, US & CA, not Quebec, 13+).