This list includes 46 Anime that start with O, from “Oda Cinnamon Nobunaga” to “Ozma”. Titles range from TV series and films to OVAs and specials, spanning historical, sci-fi, and slice-of-life genres. Use it as a quick reference for fans, bloggers, and catalogers.
Anime that start with O are anime titles whose official romanized names begin with the letter O. Many entries include popular franchises and obscure OVAs; for example, “Oda Cinnamon Nobunaga” mixes historical comedy with pet-personified samurai.
Below you’ll find the table with Title, Studio, Year, and Genre.
Title: The display title helps you locate a show quickly and match alternate names.
Studio: Identifies the primary studio so you can trace production pedigree and related works.
Year: Shows the first release year, helping you place titles in a historical timeline.
Genre: Lists up to three primary genres to help you decide if a title fits your interests.
Anime that start with O
| Title | Year | Studio | Genres |
|---|---|---|---|
| Oda Cinnamon Nobunaga | 2020 | Studio Signpost | Comedy, Historical, Slice of Life |
| Odd Taxi | 2021 | OLM | Mystery, Drama |
| Oh! My Goddess | 1993 | AIC | Romance, Comedy, Supernatural |
| Ojamajo Doremi | 1999 | Toei Animation | Mahou Shoujo, Comedy, Fantasy |
| Ojisan to Marshmallow | 2016 | Creators in Pack | Comedy, Romance, Slice of Life |
| Okami Kakushi | 2010 | AIC | Mystery, Horror, Supernatural |
| Okami-san and Her Seven Companions | 2010 | J.C.Staff | Comedy, Romance, Parody |
| Okusama ga Seitokaichou! | 2015 | Seven | Comedy, Ecchi, Romance |
| Olympia Kyklos | 2020 | Gosay | Comedy, Sports, Historical |
| One Outs | 2008 | Madhouse | Psychological, Sports |
| One Piece | 1999 | Toei Animation | Adventure, Fantasy, Action |
| One-Punch Man | 2015 | Madhouse | Action, Comedy, Parody |
| Onegai Teacher | 2002 | Daume | Romance, Sci-Fi, Comedy |
| Onegai Twins | 2003 | Daume | Romance, Sci-Fi, Slice of Life |
| OniAi | 2012 | Silver Link | Comedy, Romance, Harem |
| Onigiri | 2016 | Pierrot Plus | Fantasy, Adventure, Comedy |
| Onihei | 2017 | Studio M2 | Historical, Drama, Seinen |
| Onikirimaru | 1995 | AIC | Horror, Supernatural, Action |
| Onimai: I’m Now Your Sister! | 2023 | Studio Bind | Comedy, Slice of Life, Gender Bender |
| Only Yesterday | 1991 | Studio Ghibli | Drama, Slice of Life, Romance |
| Ookami Kodomo no Ame to Yuki | 2012 | Studio Chizu | Fantasy, Slice of Life, Drama |
| Ookami Shoujo to Kuro Ouji | 2014 | TYO Animations | Romance, Comedy, School |
| Ookiku Furikabutte | 2007 | A-1 Pictures | Sports, Drama, Slice of Life |
| Orange | 2016 | Telecom Animation Film | Drama, Romance, Sci-Fi |
| Ore Monogatari!! | 2015 | Madhouse | Romance, Comedy, School |
| Ore no Imouto ga Konnani Kawaii Wake ga Nai | 2010 | AIC Build | Comedy, Slice of Life, Drama |
| Ore no Nounai Sentakushi ga… | 2013 | Diomedéa | Comedy, Romance, School |
| Ore, Twintail ni Narimasu. | 2014 | Production IMS | Action, Comedy, Sci-Fi |
| Oregairu | 2013 | Brain’s Base | Drama, Romance, Slice of Life |
| Oresuki: Are you the only one who loves me? | 2019 | Connect | Comedy, Romance, School |
| Origin: Spirits of the Past | 2006 | Gonzo | Sci-Fi, Fantasy, Adventure |
| Oruchuban Ebichu | 1999 | Gainax | Comedy, Ecchi, Slice of Life |
| Osomatsu-san | 2015 | Pierrot | Comedy, Parody, Gag |
| Otaku Elf | 2023 | C2C | Comedy, Slice of Life, Supernatural |
| Otaku no Video | 1991 | Gainax | Comedy, Drama |
| Otome Game no Hametsu Flag shika Nai… | 2020 | Silver Link | Isekai, Comedy, Romance |
| Otome Youkai Zakuro | 2010 | J.C.Staff | Romance, Supernatural, Historical |
| Ouran High School Host Club | 2006 | Bones | Comedy, Romance, Harem |
| Outbreak Company | 2013 | Feel | Isekai, Comedy, Fantasy |
| Outlanders | 1986 | AIC | Action, Sci-Fi, Romance |
| Over Drive | 2007 | Xebec | Sports, Drama |
| Overlord | 2015 | Madhouse | Isekai, Fantasy, Action |
| Owari no Seraph | 2015 | Wit Studio | Action, Fantasy, Drama |
| Owarimonogatari | 2015 | Shaft | Mystery, Supernatural, Psychological |
| Overtake! | 2023 | Troyca | Sports, Drama |
| Ozma | 2012 | LandQ Studios | Sci-Fi, Adventure, Action |
Descriptions
Oda Cinnamon Nobunaga
A TV series where famous Japanese warlords, including Oda Nobunaga, are reincarnated as cute dogs in modern Japan.
Odd Taxi
A critically acclaimed TV mystery following a walrus taxi driver who gets entangled in a case of a missing girl.
Oh! My Goddess
A classic OVA series where a college student accidentally summons a goddess who grants him one wish.
Ojamajo Doremi
A beloved TV series about a group of elementary school girls who become witch apprentices.
Ojisan to Marshmallow
A short-form TV anime centered on an office lady’s attempts to get the attention of her marshmallow-loving older coworker.
Okami Kakushi
This TV series follows a boy who moves to a remote village with strange, ancient customs and a dark secret.
Okami-san and Her Seven Companions
A TV series parodying fairy tales, centered on a high school club that solves students’ problems.
Okusama ga Seitokaichou!
A short-form TV series about a boy who finds himself engaged to the assertive student council president.
Olympia Kyklos
This unique short-form TV anime follows a Greek vase painter who time-travels to the 1964 Tokyo Olympics.
One Outs
A high-stakes TV anime where a prodigy pitcher joins a pro baseball team with a contract based entirely on gambling.
One Piece
The legendary, long-running TV series following Monkey D. Luffy and his pirate crew in search of the ultimate treasure.
One-Punch Man
A viral TV hit about a hero so powerful he can defeat any enemy with a single punch, leading to existential boredom.
Onegai Teacher
A TV series about a high school student who marries his beautiful, secretly alien, teacher to save her from deportation.
Onegai Twins
A TV spinoff of Onegai Teacher about three orphans who may be related, living under one roof.
OniAi
This TV series follows Akito Himenokouji, who is reunited with his long-lost, overly affectionate twin sister.
Onigiri
A short-form TV series based on an MMORPG, set in a mythical version of ancient Japan full of monsters.
Onihei
A TV series set in the Edo period, chronicling the life of a stern but just police chief known as “Heizo the Demon.”
Onikirimaru
A dark fantasy OVA series about a half-demon boy who hunts other demons with his powerful ancestral sword.
Onimai: I’m Now Your Sister!
A TV series in which a shut-in otaku is transformed into a middle school girl by his younger sister’s experiment.
Only Yesterday
A poignant Studio Ghibli film about a 27-year-old woman reminiscing about her childhood while traveling in the countryside.
Ookami Kodomo no Ame to Yuki
Known as “Wolf Children,” this beloved film tells the story of a mother raising her two half-human, half-wolf children alone.
Ookami Shoujo to Kuro Ouji
This TV series, “Wolf Girl and Black Prince,” follows a girl who pretends a popular boy is her boyfriend, only for him to blackmail her.
Ookiku Furikabutte
Called “Big Windup!,” this TV series is a character-driven baseball anime focused on teamwork and psychology.
Orange
A TV series where a high school girl receives letters from her future self, urging her to prevent a tragic event.
Ore Monogatari!!
Known as “My Love Story!!,” this charming TV series follows a large, kind-hearted boy and his first-ever girlfriend.
Ore no Imouto ga Konnani Kawaii Wake ga Nai
Oreimo is a TV series about a high school student who discovers his popular younger sister is secretly an otaku.
Ore no Nounai Sentakushi ga…
Known as “Noucome,” this TV series features a boy cursed with having to make absurd choices at random moments.
Ore, Twintail ni Narimasu.
A bizarre TV series where a boy obsessed with twintails gains the power to transform into a female warrior to fight aliens.
Oregairu
A popular TV series about a cynical and pragmatic high schooler forced into a service club to help others.
Oresuki: Are you the only one who loves me?
A TV series that deconstructs harem tropes, where the protagonist’s plans to get a girlfriend backfire spectacularly.
Origin: Spirits of the Past
A post-apocalyptic film where a boy awakens a mysterious girl from the past, disrupting the balance between humanity and the forest.
Oruchuban Ebichu
A notoriously raunchy TV short series about a talking hamster trying her best to manage her irresponsible owner’s life.
Osomatsu-san
A modern TV reboot of a classic 60s anime, following the chaotic and hilarious lives of the sextuplet Matsuno brothers.
Otaku Elf
A heartwarming TV series about a shrine maiden who must coax a centuries-old, video-game-loving elf goddess out of her shell.
Otaku no Video
A classic two-part OVA that serves as a satirical, semi-autobiographical look at the rise of otaku culture in 1980s Japan.
Otome Game no Hametsu Flag shika Nai…
Nicknamed “HameFura,” this TV series follows a girl reincarnated as the villainess of a dating sim who tries to avoid her doom flags.
Otome Youkai Zakuro
Set in an alternate Meiji era, this TV series follows half-demon girls who partner with human soldiers to fight supernatural threats.
Ouran High School Host Club
A beloved TV parody of shojo tropes, about a scholarship student who stumbles upon a group of rich boys running a host club.
Outbreak Company
In this TV series, a pure-blooded otaku is sent to a fantasy world as a cultural missionary to spread anime and manga.
Outlanders
A classic 80s OVA about a human photojournalist who gets caught in an interstellar war and an arranged marriage with an alien princess.
Over Drive
A TV anime following a high school student with no athletic ability who discovers a passion for road bicycle racing.
Overlord
A popular TV series where a player gets trapped in an online game as his powerful undead lich character, Ainz Ooal Gown.
Owari no Seraph
Seraph of the End is a TV series set in a world where vampires have enslaved humanity after a virus wiped out most adults.
Owarimonogatari
A key TV arc in the Monogatari Series, delving into the past of protagonist Koyomi Araragi and the nature of oddities.
Overtake!
An original TV anime focusing on the competitive world of Formula 4 racing and the lives of the drivers and photographers involved.
Ozma
An ONA series created from an unused 1980s script by Leiji Matsumoto, set on a desert planet in the distant future.