Hussainiya may refer to:

• Hussainiya, a congregation hall for Shia commemoration ceremonies

or – amongst others – for the following populated places:

• Husseiniya, Jordan, a department and city in Ma'an Governorate, Jordan.
• Husseiniya, al Sharqia, a province and city in al Sharqia Governorate, Egypt.
• Husseiniya, Iraq, a town in Baghdad Governorate, Iraq.
• al-Husayniyya, Safad, a depopulated Palestinian village.

• Riemann space
• Riemann's surface
• Riemann sums
• Riemann Surface
• Riemann Surfaces
• Riemann symmetric space
• Riemann tensor (general relativity)
• Riemann theta function
• Riemann Xi function
• Riemann xi-function
• Riemann Xi-Function
• Riemann xi function
• Riemann zeta
• Riemann zeta function zeros
• Riemann zeta-hypothesis
• Riemann Ξ function
• Riemann ζ-function
• Riemann–Cartan geometry
• Riemann–Hilbert correspondence
• Riemann–Hilbert problem
• Riemann–Roch theorem for algebraic surfaces
• Riemann–Roch theorem for smooth manifolds
• Riemann–Roch theorem for surfaces
• Riemann–von Mangoldt formula
• Riemenschneider