Jania may refer to:

• Jania (given name), a female given name, also spelled Janiya
• Jania (alga), J.V.Lamouroux, 1812, a coralline algae genus
• Jania Schult. & Schult.f., 1830, a plant genus, now considered a synonym of Moraea
• Jania, a 1996 album by Pakistani singer Ali Haider
• Jania, Barpeta district, a Satra holding village of Barpeta District, Assam, India
• Jania (Vidhan Sabha constituency), an assembly constituency of Assam Legislative Assembly in India
• Al-Janiya, Palestinian village on the occupied West Bank

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