- O'Barr, James - Writer / Artist
- O'Brien, Dani - Web Comic Creator, All New Issues
- O'Brien, Liam - Voice Actor
- O'Connell, Sean P. - Voice Actor
- O'Donnell, John - Managing Director, Central Park Media
- O'Halloran, Jack - Actor / Boxer
- O'Hare, Heidi - Costume Designer, University of North Carolina at Charlotte
- O'hashi, Takashi - Musician
- O'Malley, Elizabeth - Costumer / Host, AnimeCons TV
- O'Rear, Jim - Actor / Stuntman
- O'Reilly, Sean - Editor-in-Chief / Owner, Arcana Studios
- O'Rourke, Shaun - Voice Actor
- O'Shaughnessey, Colleen Ann - Voice Actress
- Oat, Zach - Wizard Entertainment
- Obari, Masami - Director
- Ober, Arlon - Composer
- Ochikoshi, Tomonori - Producer, A-1 Pictures
- Odagi, Mio - Manga Artist
- Odaiko New England - Taiko Drummers
- Odjick, Jay - Comic Book Writer / Artist
- Ogata, Megumi - Voice Actress / Singer
- Ogura, Hiromasa - Art Director
- Ohara, Momoka - Voice Actress
- Ohata, Koichi - Director
- Ohmi, Tomoe - Singer / Actress
- Ohnishi, Nobuyuki - Artist
- Ohno, Minoru - Professor / Producer, Shokei Gakuin University
- Ohtani, Ikue - Voice Actress
- Ohtsuka, Tommy - Manga Artist
- Okabayashi, Kensuke - Artist
- Okada, Mari - Screenwriter
- Okada, Toshio - Founder, Gainax
- Okamiya, Michio - Musician
- Okamoto, Hideo - Mecha Designer
- Okamoto, Maya - Voice Actress
- Okamoto, Nobuhiko - Voice Actor
- Okamura, Tensai - Director / Animator
- Okamura, Yoshiyuki - Manga Artist
- Okasako, Nobuhiro - Animation Director
- Okawara, Kunio - Animation Director
- Okazaki, Kosuke - Editor, Ultra Jump
- Okazaki, Takashi - Manga Artist
- Oki, Mamiya - Manga Artist
- Okiayu, Ryotaro - Voice Actor
- Okiura, Hiroyuki - Character Designer / Animation Director
- Okouchi, Ichiro - Screenwriter
- Okuda, Amy - Actress
- Okuda, Hitoshi - Manga Artist
- Okui, Masami - Singer
- Old Rusty Shack - Band
- Oliff, Steve - Colorist
- Olivas, Estevan - Fandubber
- Oliver, Jana G. - Author
- Oliver, Mark - Voice Actor
- Oliver, Nicole - Voice Actress
- Oliver, Tony - Voice Actor / Producer / Director
- Olmos, Edward James - Actor
- Olsen, Lillian - Translator / Interpreter, Viz LLC
- Omi - Web Comic Artist, Counter Culture
- OMNY Taiko - Taiko Drummers
- Omodaka - Composer
- One Hard Night - Band
- One-Eyed Doll - Band
- OneUps, The - Band
- Onyskow, Joseph - Writer / Manager, Dragon Spirit Studios
- Onyskow, Kristene - Dragon Spirit Studios
- Oppliger, John - Anime Guru, AnimeNation
- Orange, David - Actor / Writer
- Order of Týr - Band
- Oreskaband - Band
- Origa - Vocalist
- Orikasa, Ai - Voice Actress
- Orikasa, Fumiko - Voice Actress
- Orr, Corinne - Voice Actress
- Orrù, Daniela - Comic Artist, Dany&Dany
- Ortega, Joshua
- Ortiz, Lisa - Voice Actress
- Ortiz, Mariela - Voice Actress, ADV Films
- Osaka, Hiroshi - Character Designer / Animation Director
- Osborn, Dr. - Magician
- Osborne, J. David - Author
- Osborne, Jonathan - Voice Actor
- Osebold, Patti Reiko - Artist
- Oshii, Mamoru - Director / Writer
- Oshimizu, Sachi - Manga Artist
- Osmond, Andrew - Journalist
- Osueke, Austin - CEO, eigoMANGA
- Osuga, Akito - Actor
- Ota, Katsushi - Editor
- Ota, Yuko "Aido" - Web Comic Artist, Fallen / Johnny Wander
- Otaku Duet - Musicians
- Oto-Wa Taiko - Taiko Drummers
- Otokage - Band
- Otomo, Katsuhiro - Writer / Director
- Otsuka, Hiroki - Manga Artist
- Otsuka, Taku - Producer, Bandai
- Ott, John - Artist, Studio Go
- Oulette, Martin - Assistant Editor, Protoculture Addicts
- Oum, Monty - Animator, Rooster Teeth
- Outland Armour - Fabrication and Production Company
- OverClocked ReMix - Music Organization
- Overton, Wil - Artist
- Owada, Hideki - Mangaka
- Owen, Kai - Actor
- Owen, Race - Founder and President, Decipher Pictures
- Oxley, Kate - Voice Actress, Funimation Entertainment
- Oxx, Mike - Sculptor, Ninja Studios
- Oyama X Nitta - Musicians
- OZ - Band
- Ozaki, Masayuki - Executive Producer, Sunrise, Inc.
- Ozaki, Takaharu - Filming Advisor, A-1 Pictures
- Ozawa, Kaoru - Animation Director
- Ozawa, Tadashi - Author / Artist
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