Mac Barnett (born August 23, 1982) is an American writer of children's books living in Oakland, California.
Barnett graduated from Pomona College, where he studied under the writer David Foster Wallace.
Extra Yarn, a picture book illustrated by Jon Klassen, won the 2012 Boston Globe–Horn Book Award and 2013 E.B. White Read Aloud Award. It was a Caldecott Medal Honor Book.
- Brixton Brothers mystery novels published by Simon & Schuster (S&S):
- The Case of the Case of Mistaken Identity, illustrated by Adam Rex (Oct 6, 2009)
- The Ghostwriter Secret, illus. Adam Rex (Oct 5, 2010)
- It Happened on a Train, illus. Adam Rex (Oct 4, 2011)
- Danger Goes Berserk, illus. Matthew Myers (Oct 2, 2013)
- Billy Twitters and His Blue Whale Problem, illustrated by Adam Rex (Hyperion Books, June 23, 2009)
- Guess Again!, illustrated by Adam Rex (Simon & Schuster, September 15, 2009)
- The Clock without a Face: a Gus Twintig mystery (McSweeney's, April 27, 2010) – "by Scott Teplin, Mac Barnett & Eli Horowitz; plus faces by Adam Rex & numbers by Anna Sheffield" OCLC 460054415, board book LCCN 2011-282077
- Oh No! (Or How My Science Project Destroyed the World), illustrated by Dan Santat (Hyperion, June 1, 2010)
- Mustache!, illustrated by Kevin Cornell (Hyperion, October 25, 2011)
- Extra Yarn, illustrated by Jon Klassen (Balzer + Bray, January 17, 2012)
- Chloe and the Lion, illustrated by Adam Rex (Hyperion, April 3, 2012)
- Oh No, Not Again! (Or How I Built a Time Machine to Save History) (Or at Least My History Grade), illustrated by Dan Santat (Hyperion, June 5, 2012)
- Count the Monkeys, illustrated by Kevin Cornell, (Hyperion, June 24, 2012)
- Battle Bunny (S&S, 2013) – "by Jon Scieszka and Mac Barnett and Alex; pictures by Matthew Myers but mostly Alex." OCLC 804490869, LCCN 2012-25515
- President Taft is Stuck in the Bath, illustrated by Chris Van Dusen (Candlewick Press, 2014) LCCN 2013-943103
- Sam and Dave Dig a Hole, illustrated by Jon Klassen (Candlewick Press, Oct 2014) LCCN 2013-955959
- Telephone, illustrated by Jen Corace (Chronicle Books, September 2014) LCCN 2013-40706
- The Terrible Two - By Mac Barnett and Jory John, with illustrations by Kevin Cornell (Amulet Books - January 2015)
- Rules of the House, illustrated by Matthew Myers (Hyperion, forthcoming Apr 2015) LCCN 2014-15780
- The Skunk, illustrated by Patrick McDonnell (Roaring Book Press, forthcoming Apr 2015)
- Leo A Ghost Story, illustrated by Christian Robinson
- "Best of Friends", Funny Business (Guys Read, 1), ed. Jon Scieszka (NY: Walden Pond Press, 2010) OCLC 758985737
- 2015 Winner, Irma Black Award
- "Past Winners (Irma Black Award)". www.bankstreet.edu. Bank Street College of Education. Retrieved May 8, 2016.