Odd Boy Out: young Albert Einstein by Don Brown. New York: Houghton Mifflin, 2004.

Of Numbers and Stars: the story of Hypatia by D. Anne Love and Pam Paparone, ill. New York: Holiday House, 2006.

Offbeat, vol. 1, by Jen Lee Quick. Los Angeles: Tokyopop, 2005.

Old Turtle and the Broken Truth by Douglas Wood and Jon J. Muth, ill. New York: Scholastic Press, 2003.

Olive the Other Reindeer by Vivian Walsh and J. Otto Sebold, ill. San Francisco, CA: Chronicle, 1997. 

Once Upon a Tomb: gravely humorous verses by J. Patrick Lewis, ill. Cambridge, MA: Candlewick Press, 2006.

On the Road, Down Girl and Sit by Lucy A. Nolan and Mike Reed, ill. Tarrytown, NY: Marshall Cavendish, 2005.

On the Road to Perdition: Detour by Max Collins and Steve Lieber ill. New York: DC Comics, 2004.

One by Kathryn Otoshi. San Rafael, CA: KO Kids Books, 2008.

One April Morning: Children Remember the Oklahoma City Bombing by Nancy Lamb and Floyd Cooper, ill. New York: Lothrop, Lee & Shepard, 1996.

One Beetle Too Many: The Extraordinary Adventures of Charles Darwin by Kathryn Lasky and Matthew Trueman, ill. Sommerville, MA: Candlewick Press, 2009.

One Hen: One Small Loan Made a Big Difference by Katie Smith Milway and Eugenie Fernandes, ill. New York: Kids Can Press, 2008.

One Hundred Demons by Lynda Barry. Seattle: Sasquatch, 2002.

One Piece, Romantic Dawn, Vol 1 by Eiichiro Oda. San Francisco, VIZ Media, 1997.

One special summer by Jacqueline and Lee Bouvier.  New York:  Rizzoli International Publications, 2006.

One thousand tracings: healing the wounds of World War II by Lita Judge. New York: Hyperion, 2007.

Only Passing Through: The Story of Sojourner Truth by Anne Rockwell and Gregory Christie, ill. New York: Alfred A. Knopf, 2000.

Other Side, The by Jacqueline Woodson and E.B. Lewis, ill. New York: Putnam, 2001.

other side, the by Istvan Banyai. San Francisco: Chronicle Books, 2005.

Otomen, Vol 1 by Aya Kanno. San Francisco, CA: Viz Media, LLC., 2009.

Our Abe Lincoln by Jim Aylesworth. New York: Scholastic, 2009.

Oversight: short stories 1990-2005 by Phillip Hester. Berkeley, CA: Image Comics, 2006.

Owen and Mzee: The Language of Friendship by Isabella Hatkoff, Craig Hatkoff, Dr. Paula Kahumbu and Peter Greste, ill.  NY:  Scholastic Press, 2007.

Owly: the way home and the bittersweet summer by Andy Runton. Marietta, GA: Top Shelf Productions, 2004.

Owly, volume 2, Just a Little Blue by Andy Runton. Marietta, GA: TopShelf, 2005.

Owney: The Mail-Pouch Pooch by Mona Kerby and Lynne Barasch, ill. New York, NY: Farrar, Straus and Giroux, 2008.