Mayu Shinjo (新條まゆ Shinjō Mayu?, born January 26, 1973) is a Japanese manga artist. She debuted in 1994 in Shogakukan's Shōjo Comic with "Anata no Iro ni Somaritai". She continued writing for Shogakukan until 2007, with her works appearing in both Shōjo Comic and their other magazine Cheese!. She left the company to go freelance citing a dispute over working conditions and abusive treatment by her editor.
Shinjo made her debut at publisher Shogakukan in 1994, drawing series for Shōjo Comic magazine. In 2007 she left the company, noting that her editors were excessively demanding and abusive, creating a stressful work environment. 
In her blog, Shinjo noted that though she was the actual creator of her manga titles, she was one of the last to know about any adaptation plans for her series, even learning about some through TV channel websites instead of her editor. When she decided to leave, one editor threatened to take all of her earlier series out of print, but Shinjo contacted a lawyer and the threat was never carried out.
Dates listed are dates for original serialization.
- (1995) Make Love shiyo!!
- (1996) Sexy Guardian (SEXYガ―ディアン?)
- (1996) Suki Shite Sadist (すきしてサディスト?, lit. Love Me Sadist)
- (1997) Kaikan Furēzu (快感 フレーズ?); English translation: Sensual Phrase
- (2001) Akuma na Eros (悪魔なエロス?, lit. Devilish Eros)
- (2003-2004) Kimi sae mo Ai no Kusari
- (2002-2004) Haou Airen (覇王・愛人?, lit. Surpreme King's Mistress)
- (2004-2006) Rabu Serebu (ラブセレブ?); English translation: Love Celeb
- (2006-2007) Ai wo Utau yori Ore ni Oborero! (愛を歌うより俺に溺れろ!?); English translation: Blaue Rosen
- (2006-2007) SEX=LOVE2
- (2008) Midnight Children
- (2009) Apple
- (2009) Hāto no Daiya (ハートのダイヤ?, lit. The Diamond of Heart)
- (2009) Ayakashi Koi Emaki
- (2010) Goshimeidesu
- "Sensual Phrase's Mayu Shinjo Leaves Shogakukan". Anime News Network. 2007-06-05. Retrieved 2009-01-24.
- "Mayu Shinjo and Shogakukan Go Separate Ways". ComiPress. 2007-05-30. Retrieved 2008-09-11.
- "Sensual Phrase's Shinjo Explains Why She Left Magazine". Anime News Network. 2008-06-10. Retrieved 2009-01-24.
- "Shonen Sunday, Artists Comment on Zatch Bell Lawsuit (Updated)". Anime News Network. 2008-06-15. Retrieved 2008-09-11.
- "Shinjo Blogs about Canned Sensual Phrase Film Talks". Anime News Network. 2008-12-05. Retrieved 2008-12-08.
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ca:Mayu Shinjo it:Mayu Shinjō ru:Синдзё, Маю zh:新条真由