Ritsu may refer to:

• Vinaya, the Buddhist regulatory framework
• Risshū (Buddhism), a name of a Japanese school of Buddhism strictly following this framework
• the historical Japanese term for a criminal code as part of the Ritsuryō law system
• Ritsu scale, a type of musical scale; see Ritsu and ryo scales

People with the given name

• Ritsu Doan (堂安 律, born 1998), Japanese footballer
• Ritsu Ito [ ja] (伊藤 律), subject in a forged interview on The Asahi Shimbun
• Grayce Uyehara, born Grayce Ritsu Kaneda (1919–2014), Japanese-American activitst
• Ritsu Saito (斉藤 律), former guitarist in The Stalin

Fictional characters

• Ritsu (律), a character in the manga series Assassination Classroom
• Ritsu (律), a character in the ONA and anime series Kemurikusa
• Ritsu (リツ), a character in the manga and anime series Fire Force
• Ritsu Enshū (円周 率), a character in the light novel series R-15
• Ritsu Hagio (萩尾 律), a character in the television drama series Hanbun, Aoi
• Ritsu Haraguchi (原口 律), a character in the manga series Chūgakusei Nikki
• Ritsu Hayakawa (早川 律), a character in the manga series Gin no Spoon
• Ritsu Imai (今井 律), a character in the anime series Mewkledreamy
• Ritsu Kageyama (影山 律), a character in the manga and anime series Mob Psycho 100
• Ritsu Kai (甲斐 リツ), a character in the novel Hana no Furu Gogo
• Ritsu Kamiji, a character in the visual novel series Parascientific Escape
• Ritsu Kasanoda (笠野田 律), a character in the manga and anime series Ouran High School Host Club
• Ritsu Kawai (河合 律), a character in the manga series The Kawai Complex Guide to Manors and Hostel Behavior
• Ritsu Koide (小出 律), a character in the visual novel The Fruit of Grisaia
• Ritsu Minami (南 律), a character in the manga series Loveless
• Ritsu Muses (リーツ・ミューセス), a character in the light novel series As a Reincarnated Aristocrat, I'll Use My Appraisal Skill to Rise in the World
• Ritsu Natsume (夏目 律), a character in the anime series Kado: The Right Answer
• Ritsu Onodera (小野寺 律), a character in the manga and anime series The World's Greatest First Love
• Ritsu Renjoji (蓮城寺 律), a character in the anime series Pretty Rhythm: Rainbow Live
• Ritsu Sakuma (朔間 凛月), a character in the game franchise Ensemble Stars!
• Ritsu Saotome (早乙女 律), a character in the anime series Star-Myu
• Ritsu Shikishima (式島 律), the protagonist in the anime series Caligula
• Ritsu Shioizumi (潮泉 律都), a character in the light novel series Asura Cryin'
• Shito Ritsu (Chinese: 司徒律), a character in the manhua Spiritpact
• Ritsu Soma (草摩 利津), a character in the manga and anime series Fruits Basket
• Ritsu Tainaka (田井中 律), a character in the manga and anime series K-On!

This disambiguation page lists articles associated with the title Ritsu.
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