O'Brien, Anne Sibley. The Legend of Hong Kil Dong, the Robin Hood of Korea. Watertown, MA: Charlesbridge, 2006.

O'Brien, Patrick, ill. Captain Raptor and the Space Pirates by Kevin O'Malley. New York: Walker, 2007.

O'Conner, George. Journey into Mohawk Country. New York: First Second, 2006.

Olander, Johan. A Field Guide to Monsters: Googly-Eyed Wart Floppers, Shadow-Casters, Toe-Eaters, and other Creatures by Johan Olander. NY: Marshall Cavendish, 2007.

Oleynikov, Igor, ill. Mahalia Mouse goes to college by John Lithgow. New York: Simon & Schuster, 2007.

O'Malley, Brian Lee. Scott Pilgrim vs the World. Portland, OR: Oni Press, 2005.

O'Malley, Brian Lee. Scott Pilgrim vs the universe. Portland, OR: Oni Press, 2009.

O'Malley, Brian Lee. Scott Pilgrims Precious Little Life. Portland, OR: Oni Press, 2004.

O'Malley, Kevin. Mount Olympus Basketball. New York: Walker, 2003.

O'Neill, Kevin, ill. The League Of Extraordinary Gentlemen, Volume II by Alan Moore and Kevin O'Neill, ill. La Jolla, CA: America's Best Comics, 2003.

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

Oeming, Michael Avon and Mark Obie Wheatley. Hammer of the Gods. Orange, CA: Image, 2002.

Orff, Joel. Thunderhead Underground Falls. Gainesville, FL: Alternative Comics, 2007. 

Osborn, Kathy, ill. A Horse in the House and other strange but true animal stories by Gail Ablow. Cambridge, MA: Candlewick Press, 2007.

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

Ottaviani, Jim, Janine Johnston, and Tom Orzechowski. Levitation: Physics and Psychology in the Service of Deception. Ann Arbor, MI: G.T. Labs, 2007.

Ottaviani, Jim. Bone sharps, Cowboys, and Thunder lizards: a tale of Edwin Drinker Cope, Othniel Charles Marsh, and the gilded age of paleontology. Ann Arbor, MI, 2005.

Ottaviani, Jim. Fallout. Ann Arbor, MI: G.T. Labs, 2001.

Oubrerie, Clement, ill. Aya by Margeurite Abouet. New York: Farrar Straus Giroux, 2007.