- O'Donnell, Mark - The work of modern humorist cartoonist.
- Olindo, Christina - Italian illustrator and creator of the vampire comic "Oltre" ("Beyond"). In Italian and English.
- Oliver, J. Edward - Biography, and a showcase of various comic strips created over the past thirty years.
- Omega - Artwork, comics, movie reviews, and the occasional rant.
- Orff, Joel - Comics and drawings, including the weekly strip Great Moments in Rock 'n' Roll.
