O'Keefe, Susan Heyboer
- Includes book information, covers, reviews, and photos.
- http://www.susanheyboerokeefe.com/

Owens, Lisa L.
- (Official site) Author's biography, reviews, news, and descriptions of her books for children and young adults.
- http://www.llowens.com

Orchard, Christopher
- (Official site) Writer of the "Adventures of Patricia and Annabelle" series. Contains information on author and the books.
- http://www.christopherorchard.com/

Olsen, Carol
- (Official site) Author of Left-Over Louie, Slime and Camp Write-Away. Includes biography, school visits information, and sample pages of her work.
- http://www.gigharborpress.com/

Oakley, Graham
- Unofficial fan site of the English author/illustrator. Contains biography, bibliography, awards, and books in print.
- http://www.alia.org.au/~kwatson/oakley/oakley.html

Orr, Wendy
- (Official site) Features the Canadian/Australian author's biography, interview, book information, and resources for teachers and students.
- http://www.wendyorr.com/