Johan Jensen may refer to:

• Johan Jensen (mathematician) (1859–1925), Danish mathematician and engineer
• Johan Jensen (boxer) (1898–1983), Danish boxer
• Johan Laurentz Jensen (1800–1856), Danish artist

• Acynodon iberoccitanus
• Acyntha
• ACYP1 (gene)
• ACYP2 (gene)
• Acyperas
• Acyperas aurantiacella
• Acyperas rubrella
• Acyphoderes
• Acyphoderes abdominalis
• Acyphoderes acutipennis
• Acyphoderes amoena
• Acyphoderes auricapilla
• Acyphoderes aurulenta
• Acyphoderes ayalai
• Acyphoderes bayanicus
• Acyphoderes carinicollis
• Acyphoderes cracentis
• Acyphoderes cribricollis
• Acyphoderes crinita
• Acyphoderes dehiscens
• Acyphoderes delicata
• Acyphoderes fulgida
• Acyphoderes hirtipes
• Acyphoderes itaiuba
• Acyphoderes longicollis